Adapter battery unit for backup powering video camera devices

A method of providing uninterrupted power to an electronic device comprising the steps of:

• providing an adapter battery unit comprising a power source having a battery and a charging controller;
• a first surface having an electrical contact configured to electrically connect the battery to an electronic device, the first surface having a docking mechanism configured to mechanically connect with the electronic device;
• a second surface having an electrical contact configured to electrically connect the electronic device with a backup battery unit;
• and a socket for receiving an auxiliary power supply;
• connecting the first surface of the adapter battery unit to the electronic device;
• monitoring the main battery charge state;
• and
• attaching the backup battery to the second surface of the adapter battery unit.

An adapter battery unit mounted to a video camera comprising:

• an adapter unit comprising a power source having a battery and a charging controller, a first surface having an electrical contact electrically connecting the battery to an electrical contact on a video camera docking surface, said first surface and having a docking mechanism mechanically connecting the adapter battery unit to the video camera docking surface;
• a second surface having an electrical contact electrically connecting the video camera with a backup battery unit;
• and
• a socket configured to selectively receive auxiliary power supply.