I have a GH2 and have had very good luck with the original 1200mah battery, once getting over 600 shots on a single charge. I purchased a cheap knock off and it was terrible. Camera couldn't recognize it right and it was only good for about 100 shots initially and got worse with time. Recently I purchased a new Panasonic 1200mah battery through Adorama, using a credit I had to bring the price down to a reasonable level. This battery seems to drain down much faster than the original battery that came with the camera, though it interfaces with the camera perfectly Do these batteries need a 'break-in' period? Will I get better performance out of the new battery as it nears the two-plus year age of the original? Or are there just variances between the performance of these batteries?