Also useful as a standby battery backup power, but often larger.
也有用后备电池作为备用电源的, 但往往体积较大.
With battery backup, for a long time away.
设有备用电池, 长久走时.
This closes a switch linked to the selector lever which connects the Backup lights are installed on many cars to the Battery.
驾驶员换档时接通了与变速杆相连并连接倒车灯和蓄电池的开关。
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