CAM Plus has an embedded 1200mAh battery.
It is rechargeable using a high-speed charger and a USB cable.
Charging with a high-speed charger (TA 1.8A)
Charging with a USB (from a laptop or a PC)
If the G5 battery level reaches 0%, and the phone gets turned off, it will not be charged from CAM Plus. When the remaining battery is above 15%, pressing one of the 3 buttons (On/Off, Shutter, and REC) will charge your G5 for a short period of time (around 6 minutes).
You will see a lightning icon in the battery icon on the upper corner of your phone if the LCD is on while charging. If the LCD is off, however, the LED at the top turns red.