i've stocked up on Hero 3+ units simply because Brunton makes a bacpac battery that actually seals and gives you more protection than the skeleton case.
i've gone 51 hours w/ LED off, 30 sec interval at 1A. once you plug into 2A, you get 23 hours of footage. key is to find a USB battery that can output 500mA or 800mA to really extend. otherwise you're just overcharging. Check out this site as it breaks down the details of power drain off every model of GoPros; every mA counts when you take 5000-6000 photos.
i've gone 51 hours w/ LED off, 30 sec interval at 1A. once you plug into 2A, you get 23 hours of footage. key is to find a USB battery that can output 500mA or 800mA to really extend. otherwise you're just overcharging. Check out this site as it breaks down the details of power drain off every model of GoPros; every mA counts when you take 5000-6000 photos.