I bought this kit for my GoPro Hero 4 Black Edition. The kit includes: - 2 batteries - An external charger for charging 3 batteries simultaneously - A USB / mini USB cable to connect the charger to USB adapter
I am very satisfied with the kit, it looks very good. The battery weighs 21 grams, 2 grams less than the official battery. I did not make a specific test, but the battery to keep the air as long as that official.