battery on board

基本解释

Circuit board, battery, and switches installed on the front panel.
电路板，电池，开关安装于前面板。
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By reducing the amount of computation done on board the device, caching speeds things up and saves battery life in the process.
通过减少设备上的计算量，高速缓存会起到加速的作用，并且还会延长电池寿命。
As technical difficulty, the author makes a full experiment to research the auto shaped mechanism of perfusion material flow on the solar battery board.
作为技术难点，作者对灌注料在太阳能电池板上的自动成形机理进行了详尽地研究和试验。

Weighing in at roughly 160g (5.6 ounces) with a 2, 150mAh battery on board, the 8.9mm (0.35 inch) thick handset has an 8-megapixel main camera, a 1.3-megapixel shooter up front, and runs Android 4.1 Jelly Bean as standard.
ENGADGET
But the vehicle has a small gasoline-powered generator on board that can charge the battery on the fly when it gets low.
FORBES: Who Revived The Electric Car?
This configuration gives it all wheel drive and also allows the ECU to either send power to or retrieve power from (in the form of regeneration) either motor to recharge the on-board battery pack -- which can also be juiced up by plugging into the wall.
ENGADGET