Alex had forgotten to charge the battery.

亚历克斯忘了给电池充电。

When you charge the battery, ions will flow through the liquid.

当你给电池充电时，电池里的液体会发生离子运动。

Could you charge the battery?

请你把电池充一下电好吗？

He forgot to charge the battery.

他忘记给电池充电了。

Charge the battery, please.

请将电瓶充电。