Betri
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Betri (kutoka Kiingereza: "battery") ni kifaa kinachotumika kutunza chaji ya umeme kwa muda fulani.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Batteries.jpg/250px-Batteries.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/2/28/Battery_symbol2.svg/110px-Battery_symbol2.svg.png)
Ilibuniwa na Mwitalia Alessandro Volta mnamo 1800.
Betri (kutoka Kiingereza: "battery") ni kifaa kinachotumika kutunza chaji ya umeme kwa muda fulani.
Ilibuniwa na Mwitalia Alessandro Volta mnamo 1800.