power cell

例句：

1. 1. The new power cell is more efficient than the old one.
   新的电池单元比旧的更高效。
2. 2.The power cell is essential for the operation of the device.
   电池单元是该设备运行所必需的。
3. 3.The power cell needs to be charged regularly to maintain its performance.
   电池单元需要定期充电以保持其性能。