The GoPro Hero 3 does have a battery bacpac you can attach. It roughly doubles the recording time. There was a new firmware released the other day that has fixed a lot of problems. Many of the other problems have been found to be due to shithouse MicroSD cards whose write speed drops below the rate required by the camera and thus the camera freezes.
GoPro 3 with the newest firmware and a fast MicroSD card is pretty reliable now
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