Smatree&reg; Li-Polymer Battery (2-Pack) and Rapid Dual Charger for GoPro Hero3, Hero3+ With high-tech Japanese cells, rechargeable Li-polymer batteries with 1290 mAh for safer and longer battery life. They are fully fit for GoPro HERO3+ and HERO3. Mini USB dual charger can fully charge 1 or 2 batteries at a time within a couple hours Smart LED light indicated RED when charging and GREEN when complete Cannot link with AC power source directly 3-year manufacturer warranty