If your camera uses AA's, I highly recommend the Engergizer rechargable batteries. And go for the 15 minute rechargeable ones. On my old point & shoot, I had 2 sets so one could be charging while I am taking photos with my other. I could easily get 800 shots with the flash on the set of Mh2500. The other set I had were Mh2200 and I could still get 600-700 photos. Plus when they would go dead, 15 minutes later, I was back to taking more photos.
I am not a fan of the battery pack types. Yes they take more photos per charge, but then you have to wait 2+ hours to recharge. I know my Canon Rebel had the battery pack, and I am getting use to it, but I do miss the quickness of the recharge if I need it.