MRB-217P40 is a newly released 21700 Li-ion rechargeable battery by IMALENT, specially designed for high drain flashlight consumption, it optimizes all kinds of design, with high capacity and performance, safety features. compact size, compatible with various kinds of high drain flashlights. The IMALENT MRB 217P40 will definitely be your best choice of 21700 Li-ion rechargeable batteries for MS03 and MS03W Specification: High-performance Li-ion 3.6V Type C rechargeable battery,4000mAh Specially designed for high drain flashlights Safety Co-efficiency, environmentally friendly, high performance, and high quality Specially made a high-performance circuit board for battery protection: Automatically protects against overcharge,over-discharge, and battery short circuit High-quality battery protection IC The battery power regulation module utilizes five powerful MOS FEE for better efficiency and superior output included: Model: MRB 217P40 Capacity:4000mAh Voltage:3.6V Charging Current: Recommended 2A(Maximum) Weight:73g Size:Diameter 2lmm,Length75mm Warranty Period: The applicable warranty period(12 months) commences on the date that the product is purchased Precautions: Avoid the battery from immersing with water and expose it to fire. When charging or using the batteries ensure the positive and negative terminals correspond with the positive (+) and negative(-) symbols on the devices. To extend battery life it is recommended that the MRB 217P40 is charged every three months of unused period. keep out of the reach of children. If swallowed, please seek medical advice immediately.