The power source can either be a lithium-ion battery or electric piles that run by liquid hydrogen.

该款车的动力来源于锂离子电池或液态氢燃料的电堆。

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With a large, bright screen and inability to remove the battery in the iPhone 4, getting a secondary power source is inevitable if you can't guarantee a power point on your travels.

旅行时没法充电，iPhone 4屏幕硕大闪亮，再加上内置电池无法取出，是时候准备一个备用电源了。

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The system also has the potential to use the compact engine as an electrical power source to further reduce the battery burden of dismounted soldiers, which can be as high as 11kg.

同时，使用紧凑型发动机的系统只有11公斤重，其有可能会取代电池而充当电力源，以进一步降低士兵的负载量。

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"The power source for the aircraft are the two battery packs you see on either side, which are lithium ion batteries which are similar to what you find in our laptops, only custom made for us for this application."

VOA: standard.2010.08.11

Resembling a small child wearing an astronaut outfit with a backpack (for the battery power source), the ASIMO could walk on two feet at speeds at over three miles per hour.

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And when the battery charge runs low, the British supercar switches to an alternative power source, a pair of 77-pound micro-turbines that serve as onboard generators.

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Such solutions are clearly some way off commercial development, but with Apple rumored to be designing its hotly-anticipated iWatch around a power source based on kinetic and solar power, a battery-free world isn't such a distant dream.

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