THERE is nothing better than the original battery GoPro. It will ensure the granny service GoPro Hero HD2. The constant voltage as called for GoPro. I even full HD video 2h10min before there is no load. I took this from the seller Marsodeal. I had a delivery nine days from order. The problem, as explained by the seller was an error in the Post '. I believe that ultimately went well granny if it's frustrating to order a Monday, BE said it will be the Saturday and then radio silence until Monday after I contact to have the product Wednesday . Good communication with the seller. So you can buy with confidence!