在电池供电的设备中要求能尽量提高电池的使用寿命，即提高电源效率。

The service life of Battery-powered equipment is required as long as possible, so we must improve efficiency of power supply.

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许多专家认为，要不了多久，我们每天使用的各种设备就都能用燃料电池供电了。

According to many experts, we may soon find ourselves using fuel cells to generate electrical power for all sorts of devices we use every day.

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平均每个陆战队员所携带的装备中有9磅的一次性电池，用于为夜视镜和无线电台这些设备供电。

An average Marine carries about 9lbs of disposable batteries in their kit to power equipment such as night vision goggles and radios.

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