Nitecore 21700 5000mAh 3.6V Rechargeable Li-ion Battery NL2150RX Features: Size: 21700 Protected Capacity: 5000mAh (18Wh) Voltage: 3.6V Input: USB-C: 5V / 2.5A Output: USB-C: 5V / 2A Current Output: 8A Dimension: Length 78.8mm, Diameter 21.7mm Weight: 74.5g Built-in USB-C charging port with dual LED charging indicators Package Includes: 1 x Nitecore 21700 5000mAh 3.6V Rechargeable Li-ion Battery NL2150RX 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.