I don't know of a battery upgrade for the DC600 but I get about 60-70 shots or about 40 minutes on a battery charge, if you haven't bought the camera yet, the DC800 is out and has solved the battery issues, I've gotten 3 dives over 45 minutes each on a single charge with mine. I have both a DC600 with the digital strobe and a DC800 that I have set up with Sea and Sea strobes. The digital flash works quite well and I believe it is the same flash that came with the pro pack. If you are interested in picking up a used DC600 with strobe contact me. Good luck, the Sea Life Cameras work quite well and are easy to get great shots with.