The Aspire eGo USB Charger is compatible with all 510 eGo and Aspire CF batteries. The eGo Charger is an extremely convenient power source with a 1000mAh output. You can charge your Aspire CF battery by screwing it into this USB charger and plugging the other end of the charger into a USB power source. The LED light on battery will flash 3 times and then turn solid in color. The light on the USB charger will be red when charging. Once fully charged, the USB charger will display a green light, and the LED light on the battery will turn off. The Aspire USB charger can be plugged into most USB ports. You can also use it with a USB wall adapter that is sold separately.