My experience is with using GoPro cameras while fishing. I have 6 Hero2 cameras and 2 Hero3 black edition cameras. I mount the cameras around the boat to capture action including two underwater to catch billfish bites and releases. I use the battery bacpac for both the hero2 and hero3 and have to say that when the hero3 double battery runs out, i still have an entire battery left on the hero2. In other words, the hero2 double battery is lasting twice as long as the hero3 double battery. I'm filming both cameras at 1080. Not sure why such a huge discrepancy.