Nitecore NL2150 21700 5000mAh Rechargeable Li-ion Battery Yellow 6952506492848. This powerful battery has improved performance and superior energy density compared to previous 18650 batteries. An ideal companion for the NEW P12 tactical flashlight 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 NITECORE NL2150 comes with all of the safety features quality engineering and more that has made NITECORE a trusted brand for rechargeable Li-ion batteries. Your expensive electronics are safe paired with an NL2150 that features a built-in pressure relief valve high temperature resistant design and built-in safeguards to prevent surges. This protects you from overcharging over-discharging as well as short-circuits. The NL2150 is built with premium materials such as nickel-plated stainless steel connectors for impact resistance good conductivity and resistance against oxidation. Safe and reliable the NL2150 is globally insured and has multiple certifications for electronic use. Specifications for Nitecore NL2150 21700 5000mAh Rechargeable Li-ion Battery: Manufacturer: Nitecore Color: Yellow Battery Quantity: 1 Battery Capacity: 5000 mAh Power: 3.6 volts Diameter: 0.85 in Length: 2.96 in Weight: 2.57 oz Package Type: Box Battery Type: Lithium Ion Battery Chemistry: Lithium-Ion Features of Nitecore NL2150 21700 5000mAh Rechargeable Li-ion Battery A built-in pressure relief valve A microporous barrier for heat dissipation Built-in PTC for surge protection Nickel-plated stainless steel cathode and anode Abrasion-resistant coating Overcharge over-discharge protection Package Contents: Nitecore NL2150 21700 5000mAh Rechargeable Li-ion Battery NITECORE NL2150 21700 Battery Nitecore 6952506492848: NL2150 21700 5000mAh Rechargeable Li-ion Battery Yellow