great product after testing the battery charge, so evaluation possibility. batteries hold better than the original battery GoPro about 15 minutes. With gopro 4 which is just magical with the 4k but too power hungry, suddenly required additional batteries. The battery pack and the original is super load quickly with so top charger. thank you thank you thank you for thinking to transport boxes for batteries. they protected the connections when the batteries lying around in the bottom of the backpack or otherwise. Conclusion for the price is unbeatable and indispensable
