I understand batteries and power consumption, I have been an electronic tech for a lot of years and an UW photographer for a good many as well. The number of shots is pretty much a meaningless number if the batteries are not capable of keeping the camera powered up for at least 3 continous hours and taking at least 200 photos during that time period, all of which are with the flash on. If the battery capacity is not up to that, it's use as a serious UW camera is limited.