A battery or electrochemical cell that supplies power to devices; includes types like AA batteries and lithium cells used as portable power sources.
リモコンの電池を交換したらテレビが直った。
Replacing the remote control's batteries fixed the TV.
このおもちゃは単三電池2本で動く。
This toy runs on two AA batteries.
スマホの電池が午後にはほとんど残っていない。
My phone's battery is almost gone by the afternoon.