The backup battery should be replaced at least once per year.

每年应该至少更换一次备用电池。

Look for a Child unit that has a backup battery in case of power failure.

寻求一个儿童组表示，有一个备用电池，在案件的电力供应中断。

The advantages of lithium battery is to use for a long time, if not purchase a disadvantage is backup battery words can't added.

锂电池的优点是使用时间长，缺点是如果不购买备用电池的话不能随时补充。

Intelligent battery discharger is the instrument that can maintain and capacity test to battery, DC power and UPS backup battery.

智能蓄电池放电仪是专门对蓄电池组、直流电源、UPS后备电池进行维护及容量检测的仪器。

(Power outages, however, activate backup battery and safe mode, which means you can still perform tasks like unlocking a door manually).

(比如停电了。但是还有启动备用电池和安全模式的存在，这样你就可以继续你手上的活计了)。