I’ve been shooting with the camera for a few days now, and not had any issues with the battery door. I’ve also tried to recreate the door opening from pressing on the side, but have been unable to make it flick open like the video suggests. Must be just a slightly duff mechanism in that camera?
The battery indicator is not the best, but I’ve been getting pretty consistent results with the 5 unbranded batteries. I’ve just been switching them out every 30 minutes or so.
EDIT: I’ve not had any issues with stuck batteries either. I have noticed that they get pretty warm, so I suppose an older battery may swell after lots of use.