Nitecore 18650 3500mAh USB Rechargeable Li-ion Battery NL1835R Features: Capacity: 3500mAh Voltage: 3.6V Output: 500mA Weight: 49.8g Dimension: Length 69.3mm, Diameter 18.5mm Package Includes: 1 x Nitecore 18650 3500mAh USB Rechargeable Li-ion Battery NL1835R 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.