http://www.amazon.com/gp/product/B005NGKR54/ref=oh_details_o06_s00_i00

This is the one I have. 10,000mAh... Works great.

This is the adapter I bought. It works. I have mine plugged into a 9v DC battery pack and don't use the wall adapter. I have plugged it into the wall and it works, but that isn't what I got it for. I got the 20000 mah battery version and it powers the camera while recording for about 24 hours. And no you don't have to leave your battery door open. There is a hole that has a plug in it that you can pull out to pass the wire through while the door is shut.