This is a list of the sizes, shapes, and general characteristics of some common primary and secondary battery types in household, automotive and light industrial use.

Thumb
3LR12 (4.5-volt), D, C, AA, AAA, AAAA (1.5-volt), A23 (12-volt), PP3 (9-volt), CR2032 (3-volt), and LR44 (1.5-volt) batteries (Matchstick for reference)

The complete nomenclature for a battery specifies size, chemistry, terminal arrangement, and special characteristics. The same physically interchangeable cell size or battery size may have widely different characteristics; physical interchangeability is not the sole factor in substituting a battery.[1]

The full battery designation identifies not only the size, shape and terminal layout of the battery but also the chemistry (and therefore the voltage per cell) and the number of cells in the battery. For example, a CR123 battery is always LiMnO2 ('Lithium') chemistry, in addition to its unique size.

The following tables give the common battery chemistry types for the current common sizes of batteries. See Battery chemistry for a list of other electrochemical systems.

Cylindrical batteries

More information Image (AA size for scale), Names ...
Image
(AA size for scale)
Names Typical capacity
(mAh)
Nominal
voltage
(V)
Size, dia. × h. (mm) Comments
Most common Other common IEC ANSI NSN
AAAAMX2500
Mini
UM 6 (JIS) 単6
#9 (China)
LR8D425 (alkaline)25A (alkaline)625 (alkaline)
400-600 (NiMH)
1.5

1.2 (NiMH)

8.3 × 42.5 Sometimes used in pen flashlights, laser pointers, powered styluses, calculators, fishing lures.
AAAU16 or HP16 (In the UK)
Micro
Microlight
MN2400
MX2400
MV2400
Type 286 (Soviet Union/Russia)
UM 4 (JIS)(carbon-zinc)
[2] 単4
AM-4 (JIS)(alkaline)
#7 (China)
LR03 (alkaline)
R03 (carbon–zinc)
FR03 (LiFeS2)
HR03 (NiMH)
KR03 (NiCd)
ZR03 (NiOOH)
24A (alkaline)
24D (carbon–zinc)
24LF (LiFeS2)

6135-01-521-0378 United States [3]

6135-66-046-2599 Australia [4]

6135-14-425-5849 France [5]

6135-22-210-5836 Danish Realm [6]

6135-99-117-3143 United Kingdom [7]

6135-15-052-5343 Italy [8]

6135-01-601-5817 United States [9]

6135-00-826-4798 United States [10]

6135-12-162-9946 Germany [11]

6140-15-219-3801 Italy [12]

1,200 (alkaline)
540 (carbon–zinc)
800–1,200 (NiMH)
500 (NiZn)
1.5

1.2 (NiMH, NiCd)

10.5 × 44.5
(0.41 × 1.75)
Introduced 1911, but added to ANSI standard in 1959

Used in many household electronic devices.

AAU12 or HP7 (In the UK)
Pencil-sized
Penlight
Mignon
MN1500
MX1500
MV1500
Type 316 (Soviet Union/Russia)
UM 3 単3 (JIS)(carbon-zinc)
AM-3 (JIS)(alkaline)
#5 (China)
LR6 (alkaline)
R6 (carbon–zinc)
FR6 (LiFeS2)
HR6 (NiMH)
KR6 (NiCd)
ZR6 (NiOOH)
15A (alkaline)
15D (carbon–zinc)
15LF (LiFeS2)
1.2H2 (NiMH)
1.2K2 (NiCd)

6135-15-051-9613 Italy [13]

6135-66-037-7956 Australia [14]

6135-19-003-8038 Brazil [15]

6135-14-304-9752 France [16]

6135-01-601-5818 United States [17]

6135-99-195-6708 United Kingdom [18]

6135-21-844-0864 Canada [19]

6135-00-985-7845 United States [20]

6135-99-052-0009 United Kingdom [21]

2,700 (alkaline)
1,100 (carbon–zinc)
3,000 (LiFeS2)
1,700–2,800 (NiMH)
600–1,000 (NiCd)
1,500 (NiZn)
1.5

1.2 (NiMH, NiCd)

14.5 × 50.5
(0.57 × 1.99)
Introduced 1907, but added to ANSI standard sizes in 1947.

Used in many household electronic devices.
Various fractional sizes are available; e.g.:
45AA (FLYCO Ni-Cd, Ni-Mh, 600–1,500 capacity, 14.0 × 40.0, used in small electronics, such as electric shavers.
12AA (see below)

12AASAFT LS14250
Tadiran TL5101
UL142502P
CR14250 (LiMnO2)
ER14250 (LiSOCl2)

6135-01-669-4691 United States [22]

6135-01-435-4921 United States [23]

6135-14-469-5737 France [24]

6135-01-370-2599 United States [25]

6135-14-476-8989 France [26]

6135-14-484-0910 France [27]

6135-01-411-3212 United States [28]

6135-14-483-5610 France [29]

6135-99-957-5803 United Kingdom [30]

6135-12-337-5754 Germany [31]

850–1,2003 (LiMnO2)
3.6 (LiSOCl2)
14.0 × 25.0 (nom.)
14.5 × 25.0 (max.)
Same diameter as AA battery, used in small electronics, including pulse oximeters, as well as use in some computer models (such as most pre-Intel Macintosh models and some older IBM PC compatibles) as the CMOS battery. Also used in US military MILES gear and DAGR. Also used in Renishaw Probes, commonly used in CNC machines, such like ones from Haas Automation.
AR23 (carbon‑zinc)
LR23 (alkaline)
#4 (China)
1.517 × 50 More common as a NiCd or NiMH cell size than a primary size, popular in older laptop batteries and hobby battery packs.

Various fractional sizes are also available; e.g., 23 A and 45 A.

BU10 (UK)
336 (Russian Federation)
#3 (China)
R12 (carbon‑zinc)
LR12 (alkaline)
8,350 (alkaline)1.521.5 × 60 Most commonly found within a European 4.5-volt lantern battery.

Not to be confused with the vacuum tube B battery.

CU11 or HP11 (In the UK)
MN1400
MX1400
Baby
Type 343 (Soviet Union/Russia)
BA-42 (US Military Spec WWII–1980s)[32][citation needed]
UM 2 (JIS) 単2
#2 (China)
LR14 (alkaline)
R14 (carbon–zinc)
HR14 (NiMH)
KR14 (NiCd)
ZR14 (NiOOH)
14A (alkaline)
14D (carbon–zinc)

6135-00-985-7846 United States [33]

6135-99-117-3212 United Kingdom [34]

6135-15-052-5341 Italy [35]

6135-66-048-7857 Australia [36]

6135-99-733-1071 United Kingdom [37]

6135-01-576-8491 United States [38]

6135-14-353-5228 France [39]

6135-19-004-1990 Brazil [40]

6135-17-056-0142 Brazil [41]

6135-99-812-0878 United Kingdom [42]

6135-99-199-4779 United Kingdom [43]

6135-99-117-3212 United Kingdom [34]

8,000 (alkaline)
3,800 (carbon–zinc)
4,500–6,000 (NiMH)
1.5

1.2 (NiMH, NiCd)

26.2 × 50
(1.03 × 1.97)
Can be replaced with an AA cell or up to four AAA cells in parallel using a plastic sabot (size adaptor), with proportional loss of capacity.
Sub-C

SC

Type 332 (Soviet Union/
Russian Federation)
KR22C429 (NiCd)
HR22C429 (NiMH)
1,200–2,400 (NiCd)
1,800–5,000 (NiMH)
1.222.2 × 42.9
(0.87 × 1.69)
A common size for cells inside cordless tool battery packs. This size is also used in radio-controlled scale vehicle battery packs and some Soviet multimeters.

12-, 45- and 54-sub-C sizes (differing in length) are also available. Soviet 332 type can be replaced with R10 (#4, 927, BF, U8) or 1.5 V elements from 3 V 2xLR10 packs.[44][45]

DU2, HP2 or SP2 (UK)
Flashlight battery
MN1300
MX1300
Mono
Goliath
Type 373 (Soviet Union/Russia)
BA-30 (US Military Spec WWII–1980s)
UM 1 (JIS) 単1
#1 (China)
LR20 (alkaline)
R20 (carbon–zinc)
HR20 (NiMH)
KR20 (Ni-Cd)
ZR20 (NiOOH)
13A (alkaline)
13D (carbon–zinc)

6135-01-255-4786 United States [46]

6135-15-051-6850 Italy [47]

6135-14-301-9080 France [48]

6135-00-835-7210 United States [49]

6135-66-045-3419 Australia [50]

6135-17-056-0140 Netherlands [51]

6135-99-109-9428 United Kingdom [52]

6135-15-219-3387 Italy [53]

6135-01-446-8310 United States [54]

6135-15-191-8540 Italy [55]

6135-99-464-1938 United Kingdom [56]

12,000 (alkaline)
8,000 (carbon–zinc)
2,200–11,000 (NiMH)
2,000–5,500 (NiCd)
1.534.2 × 61.5
(1.35 × 2.42)
Introduced 1898 as the first flashlight battery. Can be replaced with an AA cell or a C cell using a plastic sabot (size adaptor), with proportional loss of capacity.
FR25 (carbon‑zinc)
LR25 (alkaline)
6010,500 (carbon‑zinc)
26,000 (alkaline)
1.533 × 91 Four F cells are often found within 6-volt rectangular lantern batteries.
NLady
MN9100
UM 5 (JIS) 単5
E90
LR1 (alkaline)
R1 (carbon‑zinc)
HR1 (NiMH)
KR1 (NiCd)
910A (alkaline)
910D (carbon‑zinc)

6135-99-661-4958 United Kingdom [57]

6135-15-052-5342 Italy [58]

6135-12-349-1146 Germany [59]

6135-01-031-0862 United States [60]

6135-14-439-9946 France [61]

6135-66-089-8336 Australia [62]

800–1,000 (alkaline)
400 (carbon‑zinc)
350–500 (NiMH)
1.512 × 30.2 Rechargeable nickel–cadmium and nickel–metal hydride are far less common than other rechargeable sizes.[63]

Mercury batteries of the same dimensions are no longer manufactured.

A21A21
11A
E11A
MN11
L1016
4LR23
V11GA
LR1016
4LR932 (alkaline)1811A (alkaline)

6135-99-665-9374 United Kingdom [64]

55 (alkaline)0610.3 × 16.0 Usually contains a stack of four LR932 button cells shrink wrapped together.
A23144
23A
23AE
3LR50
8F10R
8LR23
8LR932
A23S
CA20
EL12
E23A
GP12A
GP23
GP23A
K23A
L1028
LR23A
LRV08
MN21
MN23
MS21
P23GA
RVO8
VR22
V23GA[65]
8LR932 (alkaline)1811A (alkaline)

6140-22-200-0033 Danish Realm [66]

6135-14-514-2482 France [67]

6135-99-763-7271 United Kingdom [68]

55 (alkaline)01210.3 × 28.5 Used in small RF devices such as key fob-style garage door openers, wireless doorbells, and keyless entry systems where only infrequent pulse current is used.

Usually contains a stack of eight LR932 button cells shrink wrapped together.

A27GP27A
MN27
L828
27A
V27A
A27BP
G27A
8LR732 (alkaline)22 (alkaline)0128.0 × 28.2 Used in small RF devices such as car alarm remote controls. Can also be found in some cigarette lighters. May be made of eight LR632 cells.
BA5800BA5800/U (LiSOCl2)
BA5800A/U (LiSO2)

6135-25-145-8796 Norway [69]

6135-01-440-7774 United States [70]

6135-99-760-9742 United Kingdom [71]

7,500 (LiSO2)05.3 (LiSO2)35.5 × 128.5 Has both terminals at the same end and is roughly the size of two stacked D cells. Used in military hand-held devices such as the PLGR.
DuplexEver Ready No. 82R10

6135-26-050-3959 Portugal [72]

6135-17-703-2958 Netherlands [73]

6135-14-305-9243 France [74]

0321.8 × 74.6 Internally contains two 1.5 V cells hence the nickname 'Duplex'. Is sometimes erroneously marketed as a "B" cell battery due to the similar size.

In Switzerland as of 2008, 2R10 batteries accounted for 0.003% of primary battery sales.[75]

4SR44PX28A
A544
K28A
V34PX
476A
L1325F
28L
4LR44 (alkaline)

6135-01-444-2637 United States [76]

6135-14-549-0239 France [77]

6135-01-268-2151 United States [78]

110–150 (alkaline)
170–200 (silver‑oxide)
06.2 (alkaline)
06.5 (silver‑oxide)
13 × 25.2 Used in film cameras, medical instruments, dog training devices. Often simply a stack of four SR44 (LR44) button cells shrink wrapped together.
Close

Rectangular batteries

More information Image (AA size for scale), Names ...
Image
(AA size for scale)
Names Typical capacity
(mAh)
Nominal
voltage (V)
Terminal layout Dimensions
(mm)
Comments
Most common Other common IEC ANSI NSN
Thumb4.5-volt 1289 (in the UK)
Pocketable battery
4.5 V
MN1203
Type 3336 (Soviet Union/Russia)
3LR12 (alkaline)
3R12 (carbon‑zinc)
3LR12 (alkaline)
3R12 (carbon‑zinc)

6135-14-376-5079 France [79]

6135-01-125-4867 United States [80]

6135-13-119-1782 Belgium [81]

6135-15-212-3288 Italy [82]

6135-14-226-6412 France [83]

6135-14-552-6802 France [84]

6135-15-167-7801 Italy [85]

6135-12-120-1247 Germany [86]

6135-26-050-3958 Portugal [87]

6135-33-155-0999 Spain [88]

6,100 (alkaline)
1,200 (carbon‑zinc)
Alkaline carbon‑zinc
(3 cells):
4.5
Two 6–7 mm wide metal strips
+: shorter strip
−: longer strip
H: 67
L: 62
W: 22
This battery, introduced in 1901, was very common in continental Europe until the 1970s. It usually contains three B cells in series.

In Switzerland as of 2008, 4.5-volt batteries account for only 1% of primary battery sales.[89]

ThumbPP3, 9-volt, or E[90]Radio battery
Smoke alarm battery
Square battery
Transistor battery
006P
MN1604
Type Krona (Soviet Union/Russia)
6LR61 (alkaline)
6LP3146 (alkaline) [91]
6F22 (carbon‑zinc)
6KR61 (NiCd)
6HR61 (NiMH)
1604A (alkaline)
1604D (carbon‑zinc)
1604LC (lithium)
7.2H5 (NiMH)
11604 (NiCd)
1604M (mercury,
obsolete)[92]

6135-01-369-9792 United States [93]

6135-99-634-8080 United Kingdom [94]

6135-19-003-7917 Brazil [95]

6135-12-186-9177 Germany [96]

6135-99-813-3838 United Kingdom [97]

6135-14-363-5842 France [98]

6135-00-900-2139 United States [99]

6135-21-898-8449 Canada [100]

6135-13-118-4403 Belgium [101]

6135-15-126-1831 Italy [102]

6135-12-380-6813 Germany [103]

6135-14-246-5048 France [104]

6135-14-368-9793 France [105]

6135-12-148-7026 Germany [106]

6135-15-209-2996 Italy [107]

6135-01-447-0949 United States [108]

565 (alkaline)
400 (carbon‑zinc)
1,200 (lithium)
175–300 (NiMH)
120 (NiCd)
500 (lithium polymer
rechargeable)
580 (mercury,
obsolete)
Alkaline carbon‑zinc
(6 cells):
9
Lithium
(3 cells):
9
NiMH / NiCd
(6, 7 or 8 cells):

7.2, 8.4 or 9.6[109]
Both on same end
+: male clasp
−: female clasp
H: 48.5
L: 26.5
W: 17.5
Added to ANSI standard in 1959.

Often contains six LR61 cells, which are similar to AAAA cells.

Thumb6-volt Lantern (Spring)Lantern
6 V
Spring top
MN908
996 or PJ996
Energizer 529
4LR25Y (alkaline)
4R25 (carbon‑zinc)
908A (alkaline)
908D (carbon‑zinc)

6135-66-131-8057 Australia [110]

6135-66-131-8057 Canada [110]

6135-01-202-8113 United States [111]

6135-12-316-9235 Germany [112]

6135-15-218-3786 Italy [113]

6135-00-643-1310 United States [114]

6135-14-226-6120 France [115]

6135-33-103-2754 Spain [116]

6135-26-050-3957 Portugal [117]

6135-12-121-1326 Germany [118]

6135-12-371-1930 Germany [119]

6135-14-306-4747 France [120]

6135-17-104-0545 Netherlands [121]

6140-15-185-7182 Italy [122]

6135-01-333-6737 United States [123]

26,000 (alkaline)
10,500 (carbon‑zinc)
Alkaline carbon‑zinc
(4 cells):
6
Springs, top
+: corner spring
−: center spring
H: 115
L: 68.2
W: 68.2
Spring terminals. Usually contains four F cells.
ThumbLantern (Screw)Lantern
6 V
Screw Top
4R25X (carbon‑zinc)
4LR25X (alkaline)
915 (carbon‑zinc)
915A (alkaline)

6135-99-645-6443 United Kingdom [124]

6135-00-643-1310 United States [125]

6135-98-104-2560 New Zealand [126]

10,500 (carbon‑zinc)
26,000 (alkaline)
6Screw posts on top of battery.
+: corner,
−: center.

Maximum diameter of the posts is 3.5 mm.
H: 109.5
L: 66.7
W: 66.7
Used in locations susceptible to high vibration/shock where connectors may be knocked off the terminals.
ThumbLantern (Big)918
R25-2
Big Lantern
Double Lantern
MN918
Energizer 521
4R25-2 (carbon‑zinc)
4LR25-2 (alkaline)
918A

6135-01-568-8832 United States [127]

6135-00-825-6692 United States [128]

6135-66-024-4371 Australia [129]

22,000 (carbon‑zinc)
52,000 (alkaline)
6Screw posts on top of battery. Labelled only, no physical keying for polarity.

Maximum diameter of the posts is 4.2 mm spaced 75 mm apart.
H: 125.4
L: 132.5
W: 73
Used in locations susceptible to high vibration/shock where connectors may be knocked off the terminals.
ThumbJ7K674LR61 (alkaline)1412A (alkaline)

6135-21-892-5239 Canada [130]

6135-01-365-2707 United States [131]

6135-12-364-9832 Germany [132]

6135-01-275-1363 United States [133]

625 (alkaline)66.5 mm2 flat contacts,
+: chamfered corner,
−: top side
H: 48.5
L: 35.6
W: 9.18
Typically used in applications where the device in question must be flat, or where one should not be able to insert the battery in reverse polarity.

Often contains four LR61 cells, which are similar AAAA cells.

Close

Camera batteries

As well as other types, digital and film cameras often use specialized primary batteries to produce a compact product. Flashlights and portable electronic devices may also use these types.

More information Image (AA size for scale), Names ...
Image
(AA size for scale)
Names Typical capacity
(mAh)
Nominal voltage (V) Shape Terminal layout Dimensions Comments
Most common Other common IEC ANSI
ThumbCR123ACamera battery
23A
123
CR123
17345
16340
CR-123A
6135-99-851-1379 (NSN)
CR17345 (lithium)5018LC (lithium)1,500 (lithium)
700 (Li–ion rechargeable)
3 (lithium)
3.6 (Li-ion)
Cylinder+: Nub cylinder end
−: Flat opposite end
H: 34.5 mm
Ø: 17 mm[134]
A lithium primary battery, not interchangeable with zinc types. A rechargeable lithium-ion version is available in the same size and is interchangeable in some uses. According to consumer packaging, replaces (BR)23A.

In Switzerland as of 2008, these batteries accounted for 16% of lithium camera battery sales.[75]
Used in flashlights and UV water purifiers.[135]

ThumbCR215270 (Li-ion rechargeable, 800 mA)
15266 (Li-ion, 600 mA)
6135-99-606-3982 (NSN)
CR15H270[136]5046LC750 (lithium)
600/800 (Li-ion types)
3 (lithium)
3.6 (Li-ion)
Cylinder+: Nub cylinder end
−: Flat opposite end
H: 27 mm
Ø: 15.6 mm
Standard discharge current: 10 mA

A common battery type in cameras and photographic equipment.

In Switzerland as of 2008, these batteries accounted for 6% of lithium camera battery sales.[75]

Thumb2CR5EL2CR5
DL245
RL2CR5
KL2CR5
6135-99-577-2940 (NSN)
2CR55032LC[137]1,5006Double cylinder.
Keyed.
Both on one end. Terminal center spacing 16 mm.H: 45 mm
L: 34 mm
W: 17 mm
Commonly used in film and digital cameras. Shaped so that it can be inserted into a battery compartment only one way.

Contains 2 CR123A cells.[138]

ThumbCR-P2BR-P2
223A
CR17-33
5024LC
CR-P25024LC[139]1,5006Double cylinder. Keyed.Both on one end.
Terminal diameter: 8.7 mm
Terminal center spacing: 16.8 mm.
H: 36 mm
L: 35 mm
W: 19.5 mm
Shaped so that it can be inserted into a battery compartment only one way.

Typical mass: 37 g.

They contain two 3 V cells exchangeable with CR123 cells.

ThumbCR-V3CRV3
RCR-V3 (Li-ion)
5047LC
5047LF (primary)[140]
3,000 (lithium)
1,300 (Li-ion)
3 (lithium)
3.6 (Li-ion)
Double cylinder flat pack. Keyed.Both on one endH: 52.20 mm
L: 28.05 mm
W: 14.15 mm
The same size as two R6 (AA) cells side by side. A rechargeable type is also made in this size.

May be used in some devices not explicitly designed for CR-V3, especially digital cameras.

CP1DLCP1
DL-CP1C
CP3553[141]2,300[142]3Prismatic.Both on one end.H: 57 mm
L: 35 mm
W: 7 mm
Shaped so that it can be inserted into a battery compartment only one way.

No longer made by Duracell, nor listed in its official website, but still stocked as of 28 February 2017 by some re-sellers.

Typical mass: 1.1 oz (31 g).[142]
Disposable equivalent of the Nikon EN-EL5 Li-ion rechargeable camera battery.[141]

Thumb 7R31 Kodak K

7R31

538

4 (mercury)

4.5 (alkaline)

Cartridge Negative along side of the body; positive on the front, nose of the battery Approx:

H: 11 mm
L: 40 mm
W: 16 mm

Typically a cartridge of three mercury button cells for use in 110 format cameras. The later version of the battery used alkaline batteries.
Close

Button cells – coin, watch

Lithium cells

Thumb
Coin cells of various diameters and thicknesses.

Coin-shaped cells are thin compared to their diameter. Polarity is usually stamped on the metal casing.

The IEC prefix "CR" denotes lithium manganese dioxide chemistry. Since LiMnO2 cells produce 3 volts there are no widely available alternative chemistries for a lithium coin battery. The "BR" prefix indicates a round lithium/carbon monofluoride cell. See lithium battery for discussion of the different performance characteristics. One LiMnO2 cell can replace two alkaline or silver-oxide cells.

IEC designation numbers indicate the physical dimensions of the cylindrical cell. Cells less than one centimeter in height are assigned four-digit numbers, where the first two digits are the diameter in millimeters, while the last two digits are the height in tenths of millimeters. Taller cells are assigned five-digit numbers, where the first two digits are the diameter in millimeters, followed by the last three digits indicating the height in tenths of millimeters.

All these lithium cells are rated nominally 3 volts (on-load), with open-circuit voltage about 3.6 volts. Manufacturers may have their own part numbers for IEC standard size cells. The capacity listed is for a constant resistance discharge down to 2.0 volts per cell.[143]

More information Names, Typical capacity (mAh) ...
Names Typical capacity
(mAh)
Standard discharge current
(mA)
Dimensions
d × h
(mm)
Comments
IEC ANSI
CR927309.5 × 2.7 Used in a variety of LED art. Also used in some Lego toys.
CR10255033LC300.110 × 2.5
CR1130700.111.5 × 3.0 A rare battery, sometimes used in car security (car alarm/keyfob batteries), organizer (backup battery for PDA such as Psion etc.), and some pedometers.

Also known as DL1130, BR1130, KL1130, L1130, ECR1130, KCR1130, E-CR1130, KECR1130[144][145]

CR12165034LC250.112.5 × 1.6 Used in some lighted watches and some LED decorator lights (electronic tea candles).
CR12205012LC35–400.1 (CR)
0.03 (BR)
12.5 × 2.0 Used in keychain LED flashlights, and in some digital cameras to keep the time and date function running even when the main battery is taken out of the camera.[146][147]
CR12255020LC500.212.5 × 2.5 Maximum discharge current: 1 mA. Maximum pulse discharge current: 5 mA.
CR161650–550.116 × 1.6 Used in automobile key remotes and in Game Boy cartridges (for powering the RAM for saved games).
CR16205009LC75–780.116 × 2.0 Used in automobile key remotes and early digital watches.
CR1632140 (CR)
120 (BR)
0.1 (CR)
0.03 (BR)
16 × 3.2 Used in automobile key remotes; e.g., Toyota Prius 2012.
CR2012550.120 × 1.2
CR20165000LC900.1 (CR)
0.03 (BR)
20 × 1.6 Frequently used in digital watches. Often used in pairs instead of CR2032 for devices that require more than 3 V, like blue/white LED flashlights.
CR2020115–12520 × 2
CR20255003LC160–1650.220 × 2.5 Frequently used in digital watches and automobile remotes.
CR20325004LC225 (CR)
190 (BR)
0.2 (CR)
0.03 (BR)
20 × 3.2 Maximum discharge current: 3 mA. Maximum pulse discharge current: 15 mA.

This is also the most common lithium cell. Commonly used on computer motherboards as nonvolatile BIOS memory and real-time clock (RTC) backup batteries, device remote controls, remote key fobs for cars and other vehicles. Also in other devices such as key finders like Apple's AirTag. Weighs around 2.9 g.[148]

CR204028020 × 4.0 Used in Skytronic PRO Audible Altimeter but also flow meters and organizers (as a memory backup battery). Has become obsolete and hard to find. Other names are BR2040, DL2040, ECR2040, E-CR2040, KCR2040, KECR2040, KL2040, L2040, L24.
CR205035020 × 5.0 Available.
CR2320110–175 [149][150][151]23 × 2
CR2325165–21023 × 2.5
CR2330265 (CR)
255 (BR)
0.2 (CR)
0.03 (BR)
23 × 3.0
BR2335[152]165 (BR)23 × 3.5
CR23545600.223 × 5.4
CR24121000.224.5 × 1.2
CR24305011LC270–29024.5 × 3.0 Used in XBand Modem to save updates and profile data.
CR24505029LC610–62024.5 × 5.0 Portable devices requiring high current (3.0 mA) and long shelf life (up to 10 years)
CR24771,0000.224.5 × 7.7 Has the highest capacity of lithium button cell batteries.[153]
CR3032500–560 (CR)
500 (BR)
0.1–0.2 (CR)
0.03 (BR)
30.0 × 3.2 Continuous discharge current taken from Panasonic Catalog.
CR1110816011.6 × 10.8 Also called CR1/3N because it is 13rd the height of an alkaline N cell, and a stack of three of them will form a battery with the same dimensions as an N cell, but with 9 V terminal voltage. Such 9 V batteries in a single package do exist but are rare and only usually found in specialist applications; they can be referred to as 3CR1/3N. However, 2CR1/3N, a 6 V battery consisting internally of a stack of two CR1/3N and standardized by ANSI as 1406LC and by IEC as 2CR13252 (though some datasheets state it as 2CR11108 instead), is sold by Duracell (PX28L[154]), Energizer (L544, now obsolete[155]), and others.

A CR1/3N is also used by photographers instead of two LR44 batteries in cameras.

Close

Silver oxide and alkaline cells

In the following table, sizes are shown for the silver-oxide IEC number; types and capacity are identified as "(L)" for alkaline, "(M)" for mercury (no longer manufactured), and "(S)" for silver-oxide. Some sizes may be interchangeably used in battery holders. For example, the 189/389 cell is 3.1 mm high and was designated 1131, while the 190/390 size is 3.0 mm high and was designated 1130, but a battery holder will accept either size.

More information Names, Typical capacity (mAh) ...
Names Typical
capacity
(mAh)
Dimensions
dia × h
(mm)
Comments
(L), alkaline
(S), silver-oxide
Most
common
Other common IEC ANSI
SR41AG3/SG3/G3-A
LR41
192/384[156]/392
6135-99-949-0402 (NSN)(S)

QR41

LR736 (L)
SR736 (S)
1135SO (S)
1134SO (S)
25–32 (L)
38–45 (S)
7.9 × 3.6
SR42242[157]
344[156]/350[158]
387S[159]
SR1136 (KOH electrolyte, 344/350)
SR1136S (NaOH electrolyte, 387S)
1139SO 63 (387S)
100 (344/350)
11.6 × 3.6
SR43AG12/SG12
LR43
L1142
186/301[156]/386
6135-99-547-0573 (NSN)(S)
LR1142 (L)
SR1142 (S)
1133SO (S)
1132SO (S)
80 (L)
120–125 (S)
11.6 × 4.2
SR44AG13/SG13
LR44/LR154
6135-99-792-8475 (NSN)(alkaline)
6135-99-651-3240 (NSN)(S)
A76/S76/EPX76
157/303[156]/357
1128 MP, 208–904, A-76, A613, AG14,
AG-14, CA18, CA19, CR44, D76A,
G13A, G13-A, GDA76, GP76A, GPA7,
GPA75, GPA76, GPS76A, KA, KA76, AG76,
L1154, L1154C, L1154F, L1154G,
L1154H, LR44G, LR44GD, LR44H,
MS76H, PX76A, PX675A, RPX675,
RW82, SB-F9, V13G, 357A
LR1154 (L)
SR1154 (S)
1166A (L)
1107SO (S)
1131SOP (S)
110–150 (L)
170–200 (S)
11.6 × 5.4 Typical internal resistance: 8 ohms
SR45AG9/SG9
LR45
194/394/380[156]
6135-99-782-4675 (NSN)(S)
LR936 (L)
SR936 (S)
48 (L)
55–82 (S)
9.5 × 3.6
SR48AG5/SG5
LR48
L750
193/309[156]/393
LR754 (L)
SR754 (S)
1136SO (S)
1137SO (S)
52 (L)
70 (S)
7.9 × 5.4
LR52A640PX, E640, EN640A, EPX640A,
MR52, PX640, PX640A[160]
LR52 (L)
MR52 (M)
1126A (L)[161] 335 (L)[161] 15.8 × 11.1[161] 1.5 V (L), 1.35 V (M)

No longer made by Duracell or Energizer, but still stocked by some re-sellers as of 26 February 2017[160]

SR54AG10/SG10/G10-A
LR54
189/387/389/390[156]
L1131/LR1130/SR1130
6135-99-796-0471 (NSN)(S)
LR1131 (L)
SR1131 (S)
1138SO (S) 44–68 (L)
80–86 (S)
11.6 × 3.1
SR55AG8/SG8
LR55
191/381[156]/391
LR1120/SR1120
LR1121 (L)
SR1121 (S)
1160SO (S) 40–42 (L)
55–67 (S)
11.6 × 2.1
365, 366,[156] S16, 608SR1116SW1177SO [162] 28–40[163][164] 11.6 × 1.651.55 V
SR56SR1126 11.6 × 2.6 Listed in IEC 60086-2:2001, but apparently no longer manufactured by any major company.
SR57AG7/SG7
LR57
195
395(low-drain)[156]/399(high-drain)[165]
LR927/SR927
SR927W/SR927SW/GR927
6135-99-796-0471 (NSN)(S)
LR926 (L)
SR926 (S)
1165SO (S) 46 (L)
55–67 (S)
9.5 × 2.6
SR58AG11/SG11
LR58
162/361/362[156]
LR721 (L)
SR721 (S)
1158SO (S) 18–25 (L)
33–36 (S)
7.9 × 2.1
SR59AG2/SG2
LR59
196/396/397[156]
LR726 (L)
SR726 (S)
1163SO (S) 26 (L)
30 (S)
7.9 × 2.6
SR60AG1/SG1
LR60
164/364[156]
LR621 (L)
SR621 (S)
1175SO (S) 13 (L)
20 (S)
6.8 × 2.1
SR62SR516SW
317[156]
LR516 (L)
SR516 (S)
11 (S) 5.8 × 1.6
SR63AG0/SG0
LR63
379[156]
LR521 (L)
SR521 (S)
10 (L)
18 (S)
5.8 × 2.1
SR64LR64
319[156]
LR527 (L)
SR527 (S)
12 (L)
20 (S)
5.8 × 2.7
SR65SR616SW
321[156]
LR65
Varta V321
6.8 × 1.65
SR66AG4/SG4
LR66
177/376/377[156]
SR626SW
LR626 (L)
SR626 (S)
1176SO (S) 12–18 (L)
26 (S)
6.8 × 2.6 Commonly used in many wrist watches.
SR67315[156]SR716 (S) 21 (S) 7.9 × 1.65
SR68SR916SW
373[156]
LR916 (L)
SR916 (S)
26 (S) 9.5 × 1.6
SR69AG6/SG6
LR69
171/370/371[156]
LR920/SR920
V371[166]
LR921 (L)
SR921 (S)
30 (L)
55 (S)
9.5 × 2.1
SR416SR416SW
337[156]
LR416 (L)
SR416 (S)
8 (S) 4.8 × 1.6
SR512 335[156] SR512SW 5.5 (S) 5.8 × 1.3
SR712SR712SWSR712 (S) 9 (S) 7.9 × 1.3
SR731SR731SW
24
329[156]
LR731 (L)
SR731 (S)
36 (S) 7.9 × 3.1
LR932LR932 (L) 40 (L) 9.3 × 3.2 Rarely used independently. 8 of these in series are used to form an A23 battery.
LR9 625

V625U

190 (L) 15.5 × 6.0 Key fob
Close

Zinc air cells (hearing aid)

Thumb
Zinc-air hearing aid batteries

Miniature zinc-air batteries are button cells that use oxygen in air as a reactant and have very high capacity for their size. Each cell needs around 1 cm3 of air per minute at a 10 mA discharge rate. These cells are commonly used in hearing aids. A sealing tab keeps air out of the cell in storage; a few weeks after breaking the seal the electrolyte will dry out and the battery becomes unusable, regardless of use. Nominal voltage on discharge is 1.2 V.

More information Names, Typical capacity (mAh) ...
Names Typical
capacity
(mAh)
Dimensions
dia. × h.
(mm)
Comments
Most common Other common IEC ANSI
5  Red tab, AC5, ZA5PR637012ZD335.8 × 2.5 Marked as "discontinued" in Energizer data sheet.[167]
10  Yellow tab, AC10, AC10/230,[168] DA10, DA230, ZA10[169][170]PR707005ZD915.8 × 3.6
13  Orange tab, ZA13PR487000ZD2807.9 × 5.4
312  Brown tab
6135-99-752-3528 (NSN)
ZA312
PR417002ZD1607.9 × 3.6
630DA630[168]7007Z1,00015.6 × 6.2 No longer listed by Duracell
675  Blue tab, ZA675PR447003ZD60011.6 × 5.4
AC41EPR437001Z39011.6 × 4.2 Discontinued[171]
Close

Lithium-ion batteries (rechargeable)

Thumb
AA size battery and an 18650 lithium ion battery

Cylindrical lithium-ion rechargeable battery

Lithium-ion rechargeable batteries are generally not interchangeable with primary types using a different chemistry, due to their higher voltage. Many are also available with protection circuits that can increase their physical length; for example, an 18650 is around 65 mm (2.56 in) long, but may be around 68 mm (2.68 in) long with a protection circuit. Some such circuits increase cell diameter instead. The increased dimensions may mean the cell will no longer fit in battery compartments intended for cells without such circuitry.

Commonly-used designation numbers indicate the physical dimensions of the cylindrical cell, as given in IEC standard 60086-1 for cylindrical primary cells. The first two digits are the nominal diameter of the cell in millimetres, and the two following digits are generally the height in millimeters, with the fifth digit indicating cylindrical shape. Alternately, the last three digits can refer to the height in tenths of a millimeter. Manufacturers may use non-IEC designations for their products.

More information Names, Typicalcapacity (mAh) ...
Names Typical
capacity
(mAh)
Dimensions (mm) Comments
Id. Other common Diameter Length
07540 80–150 7.540 Used in some electronic cigarettes.
08570 280 8.570 Used in some electronic cigarettes.[citation needed]
10180 Lithium ion 13 AAA 90 1018 Sometimes called 13 AAA. Used in tiny flashlights.
10280 Lithium ion 23 AAA 200 1028 Used in small flashlights.
10440[172] Lithium ion AAA 250–350[173] 1044 Same size as AAA cell.
10850[174][175] 700-750 10 85 Not widely available, used in some pen flashlights to replace two AAA cells in series.
13400 550 1340 Commonly used in disposable electronic cigarettes.
14250 Lithium ion 12 AA 300 1425 Same size as 12 AA cell. Used in the flashlight Lummi RAW.
14300 Lithium ion 35 AA 520, 540 1430 Slightly longer than a 14250 due to an integrated Micro-USB receptacle and charging controller. Semi-proprietary, used in FOLOMOV C2 and EDC C2 mini flashlights.
14430 400–600[176] 1443 Used in solar garden lights, toys, rechargeable shavers (e.g., some Philips/Norelco).[citation needed]
14500[177] Lithium-ion AA 700–1,000[178][179] 1453 Similar size as AA cell. Those with a protection circuit are slightly longer. Used in many LED flashlights. Nominal voltage is 3.7 V. Variants include:
  • Shorter Li-ion cell with a step-down converter to 1.5 V, e.g. Kentli 2,800 mAh.[180]
  • Non-rechargeable LS14500 primary cell (SAFT: 2,600 mAh, 3.6 V)[181]
14650[182] 940–1,200[183] 1465 Approximately 54 the length of a AA cell.
15270[184] RCR2 450–600 1527 Substitute for CR2 primary lithium. Nominal voltage usually is 3 V.
16340 RCR123A 550–800[185] 1634 Alternate substitute for CR123A primary lithium.[186] Unprotected. (16 × 36, some protected versions[187]).
16650 1,600–2,500[188] 1665 Made by Sanyo and a few others, narrower version of 18650 cells.[citation needed]
17500[189][190] A 830–1,200[191][192] 1750 The same size as an A cell, and 1.5 times the length of a CR123A. SAFT-brand cells (3600 mAh) are non-rechargeable.
17650 1,200–1,600[193] 17 65 Between the size of a 16650 and 18650.
17670[194][195] 1,250–1,600[196] 1767 Twice the length of a standard CR123A.
18350 700–1,200[197] 1835 [186]
18490[198] 800–1,400[199] 1849 Slightly shorter than a 18500 cell.
18500[200][201] 1,100–2,040[202] 1850 About the same length as an A cell, but larger diameter. Occasionally sold and marketed as a "fat-A" size.[203][204][205]
18650[206][207] 168A, 1865 1,300–3,500[208] 1865 Widely regarded as the most produced lithium-ion cell size.[209] This cell type is used in many laptop computer batteries, cordless power tools, many electric cars, electric scooters,[210] most e-bikes, older portable powerbanks, electronic cigarettes,[211][212] portable fans and LED flashlights. Nominal voltage is 3.6-3.7 V.[186]
20700[213] 2,800–4,100[214] 2070 Introduced by Sanyo/Panasonic for use in portable power tools as higher-power and higher-capacity successor for 18650 cells. [citation needed] Quickly superseded by 21700. Also used for larger electronic cigarettes.
21700 21–70, 2170 2,000–5,800[215][216] 2170 Announced by Samsung[217] and LG Chem in 2015 for use in electric bikes.[218] By January 2017, was being produced at Tesla Gigafactory 1 for the Tesla Model 3,[219] reaching a production rate of 1.8 billion cells annually (20 GWh per year) by mid-2018.[220] Also used for stationary storage (Tesla Powerwall 2 and Powerpack 2)[221] and larger electronic cigarettes.
25500[222] 2,500–5,500[223] 2550
26500 2650 About the same dimension as a C cell.
26650[224][225] 3,500–6,200[226][227] 2665 Popular size as[228] ANR26650 LiFePO
4
cell
from A123 Systems for radio control hobby use. Also used in larger, high-powered LED flashlights and some electronic cigarettes. This size is sometimes used in devices that can take either one 26650 or three AAA cells in series in a cylindrical 3-cell battery carrier.
26700 4,000-5,000 2670 LiFePO4 cells.
26800 5,500–6,800[229] 26 80 A larger format for e-bikes and transport. Used in some flashlights. Higher capacity than traditional 26650 cells.
32600[230] 3,000–6,100[231] 3260 About the same dimension as a D cell.
32650[232] 5,000–6,500[233] 3267.7 Occasionally found in larger LED flashlights.
32700 7,000 3270 LiFePO4 cells.[234]
38120 38120s, 38120HP 8,000-10,000 38120 LiFePO4 3.2 V. LiFePO4 properties: long-lasting (2000+ cycles), safer, more stable, good continuous/peak discharge rates (3C/10C), less energy dense. These cylindrical cells are widely used in EVs, including electric bikes, electric scooters, electric cars / hybrid electric cars, UPS batteries, storage batteries for solar power systems, starter batteries for cars and motorbikes etc. The Headway 38120HP cells are used in high-discharge environments as they have very good continuous/peak discharge rates (10C/25C). Because four cells in series produces a voltage range similar to 6 cells of lead-acids and their fire-resistant properties, they can be used to replace a 12 V lead-acid car battery.[235]
38140 38140s 12,000 38140 LiFePO4 3.2 V. Slightly taller version of the 38120 cells, most often used in electric bikes. Height including the screw terminals: 154 mm[citation needed]
40152 40152s 15,000 40152 LiFePO4 3.2 V. Largest cylindrical LiFePO4 cells. Height including the screw terminals: 167 mm[citation needed]
468046800[citation needed]9,000 [citation needed]4680Concept introduced by Tesla in 2020 as a high energy capacity cell for use in EVs,[236][237] and entered production in 2023.[238][239] Also planned by JAC/Volkswagen in joint-development with CBAK as of early 2021.[240] Manufacturers include Panasonic and LG.[241][needs update]
4695 46950 10,200 4695 Occasionally found in larger LED flashlights.
46120 46 120 Manufactured by Samsung SDI for future BMW cars.[242]
Close

Obsolete batteries

These types are associated with legacy applications, such as for vacuum tube equipment (A, B, and C batteries), or are no longer manufactured.

(V) = Nominal voltage
More information Names, Typical capacity (mAh) ...
NamesTypical capacity
(mAh)
(V)Ter­minal layout Dimen­sions (mm)Comments
Most commonOther common IEC ANSI
523
Thumb
PX213LR501306A580 (alkaline) 4.5 VD: 17.1
H: 49.9
Used in cameras and Apple Macintosh computers (such as the 128K through 512K and similar). As the IEC name suggests, this is often just 3 LR50 batteries stacked together.
531
Thumb
PX193LR501307AP580 (alkaline) 4.5 VD: 17.1
H: 58.3
A 523 with snap connectors attached to either end. Used in some older cameras, notably the Polaroid Automatic Land Camera packfilm models.
No. 6
Thumb
Ignition Cell,
6135-99-114-3446 (NSN)
FLAG (in UK)
R4090535,000–40,000
 (carbon‑zinc)
1.5 VD: 67
H: 172
Typical 20th century uses for this high capacity dry cell named for its 6-inch height include school science experiments, and starting glow plug model engines and in antique equipment. This dry cell is commonly used in the UK for remote level crossing telephone handsets, where solar cells and rechargeable batteries have not been specified or retrofitted. These were formerly used in primary cell powered alarms (those without mains power) and associated bell ringing, servant or nurse call systems, ignition systems, telephones,[243] to improve voice quality on long lines to the local switch by increasing the off hook line voltage, impulse wound clocks (once a minute a mechanical movement pulses to advance electrically driven hands), and (in pairs) in WWII US Navy battle lanterns.

Modern cells identified as alkaline may be one or more 'D' cells in a holder.

The terminal posts are threaded 8–32 (Unified Thread Standard), insulated terminal nuts are normally provided, conical profile helical spring terminals are added for specific applications. Stamped and formed sheet metal spring terminals for bare wire connections (fahnestock clips) were supplied for use with telephones; e.g., the Western Electric 'Blue Bell' KS-6456 printed in blue ink on a grey paper and the Eveready 'Colombia Gray Label' printed in red ink on grey paper.

+: centre; −: edge.

A Battery
Thumb
Eveready 7421.5 VMetal tabs H: 101.6
L: 63.5
W: 63.5
Used to provide power to the filament of a vacuum tube.
B Battery
Thumb
Eveready 762-S45 VThrea­ded posts H: 146
L: 104.8
W: 63.5
Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.

Multiple B batteries may be connected in series to provide voltages as high as 300 V DC.

Some versions have a tap at 22.5 volts.

GB Battery
Thumb
C Battery
Eveready 761
1.5 to 9 VThrea­ded posts or banana sockets H: 76.2
L: 101.6
W: 31.75
Originally used in vintage vacuum tube equipment for grid bias.

Still popular for school science class use as a variable voltage supply as the current version has several taps at 1.5 volt intervals.

791Eveready 791
Eveready 791-A
2R143 VD: 23.81
H: 98.43
Equivalent to two C batteries (BA-42) in series. Used in the M1 Bazooka.
15-volt
Thumb
Fuji W10
Mallory M154
NEDA 220
Rayovac 220
10F15 (Zn/MnO2) 2206515 V (10 cells) Flat round (one each end)H: 34.9
L: 15.1
W: 15.9
Used in older instruments[244] and old battery–capacitor flashes. Used in Bang & Olufsen Beomaster 2400 remote controls.

Still being manufactured as of 2020.[245]

22.5-volt
Thumb
Eveready 41215F20 (Zn/MnO2) 21514022.5 V (15 cells) Flat round (one each end)H: 50
L: 25
W: 15
Used in older instruments.[246] the Regency TR-1 (first transistor radio) and old battery–capacitor flashes. These are also sometimes known as B batteries, but are very distinct from actual B cell batteries.
30-volt
Thumb
Eveready 41320F20 (Zn/MnO2) 21014030 V (20 cells) Flat round (one each end)H: 64
L: 25
W: 15
Used in older instruments.[247] These were sometimes sold as B batteries for hearing aids and small radios.
45-volt
Thumb
Eveready 41530F20 (Zn/MnO2) 21314045 V (30 cells) Both on same endH: 91
L: 26
W: 15
Used in older instruments.[248] Sometimes were sold as B batteries.
67.5-volt
Thumb
Eveready 41621714067.5 V (45 cells) Both on same endH: 88
L: 33
W: 25
Used in older instruments.[249] Many of these were sold as B batteries for early transistor radios (before their function was replaced by the 9-volt PP3 battery).
Close

PP series

Thumb
The PP battery range

The PP (Power Pack) series was manufactured by Ever Ready in the UK (Eveready in the US). The series comprised multi-cell carbon-zinc batteries used for portable electronic devices. Most sizes are uncommon today; however, the PP3 size (and to a lesser extent PP8, used in electric fencing, and PP9) is readily available.[250] The PP4 was cylindrical; all the other types were rectangular. Most had snap terminals as seen on the common PP3 type. These came in two incompatible sizes, as is evident in some of the pictures below, those on larger, mostly older, battery types such as the PP9 being somewhat larger than those on the smaller batteries such as the PP3.

(V) = Nominal voltage
More information Image (with PP3/E-size for scale), Names ...
Image
(with PP3/E-size for scale)
NamesTypical
capacity
(mAh)
(V)Dimen­sions
(mm)
Comments
PPOther common
Thumb PP1 6H: 55.6
L: 65.5
W: 55.6
This battery had two snap connectors spaced 35 mm (1+38 in) apart.
Thumb PP3See PP3 battery
Thumb PP4226
NEDA 1600
IEC 6F24
9H: 50.0
Diameter: 25.5
ThumbPP6 246
NEDA 1602
6135-99-628-2361 (NSN)
IEC 6F50-2
8509H: 70.0
L: 36.0
W: 34.5
Center distance between terminals is max. 12.95 mm with both offset 7 mm nominal from the wider battery edge. Mass is 120 g.
ThumbPP7 266
NEDA 1605
6135-99-914-1778 (NSN)
IEC 6F90
2,5009H: 63
L: 46
W: 46
Center distance between terminals is max. 19.2 mm. Mass is 200 g.
ThumbPP8 SG8
"Fencer"
6H: 200.8
L: 65.1
W: 51.6
This battery typically had two snap connectors; however, four[clarification needed] connector versions are available. They were spaced 35 mm (1+38 in) apart. This type of battery is sometimes used in electric fencing applications.
ThumbPP9 276
NEDA 1603
6135-99-945-6814 (NSN)

IEC 6F100
5,0009H: 81.0
L: 66.0
W: 52.0
This battery has two snap connectors spaced 35 mm (1+38 in) apart.
ThumbPP10 9H: 226.0
L: 66.0
W: 66.0
This battery had two-pin connectors. They were a single ⌀3.2 mm negative pin and a single ⌀4.0 mm positive pin spaced 13.0 mm apart.
ThumbPP11 4.5 + 4.5H: 91.3
L: 65.1
W: 52.4
This battery contained two independent 4.5 V batteries, and had a four-pin connector. 9 V with a center tap was available by wiring in series. There were two ⌀3.2 mm negative pins spaced 9.5 mm apart and two ⌀4.0 mm positive pins spaced 14.3 mm apart. Negative and positive pins were spaced 18.1 mm apart. It was used in some early transistor radio amplifiers with a Class B output stage, allowing the loud speaker to be connected between the amplifier output and the battery center tap.
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Obsolete

See also

References

Further reading

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