Features:These batteries are suitable for flashlights and other electronic products.The 3.7V 5500mAh 26650 rechargeable Li-ion battery is equipped with a protection circuit board(PCB) on the positive pole.The PCB can protect batteries from overcharge, over-discharging, overload and short circuit, which can make batteries safer and longer lifespan.The battery is environment friendly and perfect for super bright flash and other devices.Size: 68.5mm26mm(Height * Diameter).