This is the 10260th most frequent Japanese word.
電池
Battery.
Here, '電池' is used as direct reference to battery or batteries essential for the operation of a device.
このリモコンには電池が必要です。
This remote control requires batteries.
In this sentence, '電池' refers to the battery specifically used in a watch, indicating its current non-functional state.
私の時計の電池は切れています。
The battery of my watch is dead.
Here, '電池' is used to denote batteries in general as an item being purchased.