I thought the Mini 0806's went of power from the car (as do almost all Dashcams). The battery isn't really necessary? Isn't it more likely a dodgy cable?
Can you temporarily rig up a different cable, even if it's hanging all over the place, just to see if that fixes the issue?
Can you temporarily rig up a different cable, even if it's hanging all over the place, just to see if that fixes the issue?