Hey, I think I've decided to purchase the Fs-4 since it will greatly extend the life of my camera, but wondered how long the battery lasts, the one that comes with the device. I have limited budget, as most people do, and would like to wait on the purchase of the extended battery for xmas or something. Also, how about the compatibility of an old bogen tripod for the camera. I'd rather buy the fs-4 and use my old bogen tripod that I used for my digital SLR camera and wait and buy a fluid head later. What are ya'll's opinion? Thanks a mil in advance. LOVE this site!!!!!!:dankk2: