Nitecore 18650 3400mAh 3.6V USB Rechargeable Li-ion Battery NL1834R Features: Micro-USB rechargeable Capacity: 3400mAh Voltage: 3.6V USB Charging Voltage: 5V USB Charging Current: Maximum 800mA Dimension: Length 70±0.3mm, Diameter 18.6±0.2mm Weight: 47.5g Package Includes: 1 x Nitecore 18650 3400mAh 3.6V USB Rechargeable Li-ion Battery NL1834R 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.