built-in battery

基本解释

MFJ-299 has a built-in battery check circuit.
MFJ-299 有一个内建的电池检查线路。
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Runs on a built-in battery - an electrical impulse within the heart initiates each contraction.
由“内置电池”供能 —— 心脏内部的电脉冲信号能激活每一次肌肉收缩。
It featured a touch-sensitive screen, with a built-in battery. Once tilted on its built-in stand, it could be used as a desktop computer with the attachable Folio keyboard.
Macintosh Folio带有触摸屏及内置电池，当使用它的附属支架立置时，可以连上Folio外接键盘当作台式电脑使用。

With a built-in battery that lasts for approximately eight hours you can enjoy your music anywhere.
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There's also the problem of the iPhone's built-in battery, which can't be swapped without a trip to the factory.
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Being waterproof with a built-in battery allows explorers of all kinds to focus their attention on what's most important: the adventure.
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