Smatree Rechargeable Battery (2-Pack) and Rapid Dual Charger USB Cable for GoPro Hero3+ / Hero 3 camera Mini USB dual charger can fully charge 1 or 2 batteries at a time within a couple hours Batteries and chargers are fully compatible with hero3+/3 cameras Smart LED light indicated RED when charging and GREEN when complete Each battery features Japanese cells, 3.7V, 1200mAh 3-year manufacturer warranty, 30 days money back no hassle