Brunton are probably best known for their innovative battery charging technology but have now brought out some GoPro related kit. Brunton have brought out the All Day for GoPro Hero 3/3+ use. It fits the Hero 3 housing and replaces the full back door.
The All Day is a high-capacity battery for GoPro cameras. It replaces the standard back door of the GoPro housing, and provides 4x the battery life over the standard battery.