I don't have a go pro(welling to buy one) and I've never watch a video on such topics but i did this time. For similar capacity shown on the batteries it's normal but the warning you saw on the description is because the speed of charging if you know what i mean, the original and the fake won't charge with the same speed the amount of power get in to the original is not the same as the fake even if they mentioning that it's the same so be careful.

For my question i would like what is the cheapest price for a good quality go pro camera(in $)?