Opteka High Capacity (2000mAh) Power Battery (2-Pack) + Fast Charger for GoPro HD HERO3+, HERO3 and GoPro AHDBT-201, AHDBT-301, AHDBT-302 Ultra high power extended 2000mAh 3.7V Extended use - 80% more then original Memory free for maximum performance Lithium Ion 7.2v Japanese cells Dual safety fuse, 2 year performance warranty