The difficult way (and the way I chose) is to purchase a car power adapter from eBay.

困难的方法(也是我所选择的方法)是从eBay上购买一个车载电源适配器。

youdao

Could a new kind of battery be recharged without a special power adapter, or even without a wall socket?

新款电池可以不通过特殊的电源适配器、甚至不用墙上的插座就可以充电么？

youdao

The power adapter has been shrunk down to a one-inch cube, so it doesn't hog an extra spot on your power strip.

电源适配器也缩小成了一个一英寸见方的小玩意儿，这样就不会占据你插线板上多余的插孔了。

youdao

The gadget is AAA battery powered and there's no power adapter or in-built power pack.

ENGADGET

The router can be powered through a USB connection or external power adapter, both included with the device.

ENGADGET: TP-Link Portable 3G Wireless N Router fits in your pocket, draws power from USB

PlugBug uses the clever trick of attaching to any Apple MacBook Power Adapter by replacing its attached plug or extended power cord.

ENGADGET: PlugBug World brings global travel to the MacBook / USB charger