backup battery

基本解释

The brain requires a constant supply of energy and 'has only a limited backup battery, ' he says.
霍洛韋說，大腦需要持續供應能量，而且“衹有有限的後備電池”。
(Power outages, however, activate backup battery and safe mode, which means you can still perform tasks like unlocking a door manually).
（比如停電了。但是還有啓動備用電池和安全模式的存在，這樣你就可以繼續你手上的活計了）。
Technical challenges remain, including integrating a leakproof backup battery into the device and miniaturising the FREE-D’s control electronics.
存在的技術難題還很多，包括將一個防漏電的備用電池集成到心泵內，還有縮小FREE-D電子元件的躰積。

After some fumbling in the dark I ripped out the failing 9-volt backup battery and it went dead.
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