バッテリー (batterī) means “battery”

More examples

外出する前にバッテリーを充電しておきます。gai shutsu su ru mae ni ba tte rī o jū den shi te o ki ma su

I charge the battery before going out.

Holds stored energy so that equipment can operate without a continuous connection to a power source.

電池denchi: A device that supplies electrical power through a chemical reaction.

化学反応などによって電気を蓄え、機器に供給するもの。ka gaku han nō na do ni yo tte den ki o takuwa e ki ki ni kyō kyū su ru mo no

The Japanese word バッテリー (batterī) comes from English battery, a word borrowed through French batterie from battre, meaning "to beat".

In everyday conversation, people often say that a phone has a low battery when it has little stored power left.