Nitecore 21700 5500mAh USB-C Rechargeable Li-ion Battery NL2155HPR Features: Size: 21700 Chemical: Li-ion / Lithium-ion Capacity: 5,500mAh 3.6V (19.8Wh) Dimensions: Length: 77±0.3mm, Diameter 21.8±0.3mm Weight: 75g Built-in USB-C charging port with dual LED charging indicators Package Includes: 1 x Nitecore 21700 5500mAh USB-C Rechargeable Li-ion Battery NL2155HPR Warranty : 1 year warranty from the date of purchase. Overdischarging or battery leakage is not covered nor is fast draining of battery while using. Please keep the voltage of all Li-Ion batteries above 3.8V for healthy storage. Recharge as soon as possible when you have run them down. Storing a depleted ( less than 3.2V open voltage ) battery may damage/ shorten life/cycle permanently. Accessories (such as pocket clip, lanyards, pouch, case, charging cable, etc), normal wear and tear, drop, physical & water damages is not covered, nor is damage resulting from abuse, neglect, battery leakage or altering this product from its original state.