I would put it in the cradle, then the green battery indicator would go up... then blink red.

我会把在摇篮里，那么绿色电池指示灯会上涨…然后闪烁红色。

youdao

Users can connect a car charger cradle for their camera battery to the solar output of the Spark, which is switchable between 6 and 12 Volts.

ENGADGET: Voltaic Spark Tablet Case powers your pad with the Sun's rays

The HotSync cradle handles the recharge and a spare battery might also come in handy.

FORBES: PDAs Grow Well Beyond The Basics

The Wii U comes with a charging cradle too, but also enables players to replace the battery as its life dwindles (unlike the batteries on my now dead original PS3 Sixaxis controller) which is an excellent development.

FORBES: Battery Life is an Often Overlooked Family Essential