Rechargeable 18600 3500mAh 3.6V battery, designed for Sea Dragon Mini 600, 650S/F, 900S, 1000F, 1300S and Mini Fluoro lights, as well as other light brands. The battery features a true 3500mAh capacity and is ultra-durable. The cell is a Panasonic-Sanyo NCR18650GA. Internal PCB protection and innovative impact-resistant design.