For an arduino powered high altitude ballooning project i want to use a camcorder to record the journey. However the battery life is a bit limited and I saw this guy here extending the battery life of a GoPro by adding a AA battery pack to the Usb port of the camera. However I am not using a go pro, just a normal camcorder. It does not use its usb port for charging, but would it work, hooking up a battery pack with a similar voltage as the charger? Is there a protection circuit in the camera (how would i tell?)?