The next generation 21700 rechargeable battery from NITECORE, the NL2150HP has an amazing 5000mAh capacity. This powerful battery has improved performance, and superior energy density compared to previous 18650 batteries. An ideal companion for the HC35 headlamp from NITECORE, an extra 21700 is a great back-up battery to have on hand, as more electronic products and NITECORE flashlights will utilize this battery. The NL2150HP is a high performance battery capable of >15A discharge for high lumen lights and headlamps. - >15A High Performance - Built-in pressure relief valve - Microporous barrier for heat dissipation - Built-in PTC for surge protection - Nickel-plated stainless steel cathode and anode - Abrasion resistant coating - Upgrade to the NL2140HP battery. Compatible with lights such as HC35 which requires a high output 21700.