This is the 317th most frequent Korean word.
배터리
Battery
The word '배터리' (battery) is used here to refer to the battery of a cellphone or a mobile device.
내 휴대폰의 배터리가 다 떨어졌어요.
The battery of my cellphone is completely drained.
In this sentence, '배터리' refers to AA batteries, a specific type of battery needed for the device.
이 장치를 사용하려면 AA 배터리가 필요합니다.
You need AA batteries to use this device.
Here, '배터리' is used in the context of recharging a battery, highlighting its electrical aspect.