Adequate emergency lighting (with a battery back-up) should be installed throughout the factory.

整个工厂需安装有足够的紧急照明系统(带有备用电池)。

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It is intended primarily for alternating current (ac) power use, but has enough battery back-up power for an hour of operation.

该设备主要适用于交流电源(AC)，但是配备的电池储备电源足够使用1小时。

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For example, it recently won an order to provide a 2.2 megawatt-hour battery, the size of a shipping container, for use in tests to back up a Chinese coal-fired power station.

例如，它最近获得了一个订单，为中国的一个火力发电厂提供一个2.2兆瓦时，集装箱大小的电池，进行备份测试。

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The SMILE Plug includes a 5V Lithium-Ion polymer battery for back-up power, making it ideal for learning environments where electrical power can be inconsistent.

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Xperia ZL also includes Battery STAMINA Mode that significantly improves the battery standby time by automatically shutting down battery-draining apps whenever the screen is off and starting them up again when the screen is back on.

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With a 1200mAh battery power bank, users can charge their phones via USB while they stream or use the speaker as a back-up power source on the go.

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