backup battery

基本解釋

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(xù)供應能量，而且“只有有限的后備電池”。
(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。但是還有啟動備用電池和安全模式的存在，這樣你就可以繼續(xù)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(nèi)，還有縮小FREE-D電子元件的體積。

After some fumbling in the dark I ripped out the failing 9-volt backup battery and it went dead.
FORBES: Hurricane Irene Sparks An Electronic Counterattack
The two 5W-powered USB ports allow users to connect even two bus-powered external hard drives and also function as a backup battery for two iPads.
ENGADGET: Hyper debuts iUSBport mini, 2 and HD cloud storage and streaming devices (hands-on)
The homes will all have solar and backup battery systems.
FORBES: Panasonic's Next Product: A Small Green Town