HI there, found out that charging works with external power, like a smartphone recharger.

Switch off your device, connect usb from recharger and a red small led at bottum side (where usb connection is placed wil burn. When you remove battery, the red light will not burn. If the charger delivers enough power your unit will switch on and will work. (no led will burn)  Great for outdoor long timeframe shooting. When on computer it looks if it will connect only to a usb connection, not charging...