02-19-2017 03:54 AM
Find a 3M or similar double-sided pad/tape (something like that you'll find on the Gopro flat/curved moint) - cut to the size of the exposed battery - and stick down.
Find another object that has a flat surface of similar size and shape (even another battery will do) and stick this the pad that you've just attached to the stuck battery. Gently pull the stuck battery from the camera.
Similar double sided pad material is available under a number of brand names (in the US, for example, ander the "Thumblock" brand - actually 3M tape).