replace battery，更換電池。
My digital watch forgot to replace the battery.
我的電子手錶忘記換電池.
The doorbell doesn't work，
its battery maybe has run out and
needs to be replaced.
門鈴不響了，也許電池已經用完了，需要更換了。
My phone can't be charged.
maybe to replace the battery.
我的手機充不了電，也許要更換電池了。