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Do you mean you can shoot 50 pictures and then the camera stops and shuts down?
If you are shooting constantly that is not bad. But if the battery is empty after 50 shots and you have to charge it every time you took 50 shots the battery needs a replacement. If you mean he camera does not switch off after 50 shots, but does not do anything you won't that is bad.
The battery should be able to make 200 pictures when fully charged. That can vary, depending on lots of things, like how many time between the shots, temperature, using flash, lots of viewing photo's or video on the camera. When the camera just shuts down after about 50 pictures, you should buy a second (and perhaps a thirty) battery.
12 is a battery disconnect within the last 50 start cycles and 55 means the end of the diagnostic cycle. Basically the computer found nothing wrong. The 12 code may seem incorrect if you haven't disconnected the battery recently, but from my experience the 12 code shows up almost all the time regardless.