Micro USB Lithium Ion Rechargeable Battery The new champion among SF18650 rechargeable batteries 3.6 volts / 3500 mAh deliver extended runtime MICRO-USB charging facilitates charging via a variety of power sources Charge. Win. Repeat. The SF18650B is a Lithium Ion-protected 18650 battery with MICRO-USB charge capability. This allows the user to conveniently charge the battery using any USB power source such as a USB wall charger, computer/laptop, power bank, or automotive USB port using the included MICRO-USB to USB cable. Additionally, an external 18650 compatible CC-CV cradle charger (not included) can be used to charge the battery; possibly at a faster rate if so equipped. The SF18650B is compatible with the following SureFire products: FURY-DFT, FURY-IB-DF, M600DF-BK, M600DF-TN, P1R-A-BK (discontinued) and P1R-B-BK. Features High-performance 3.6V 18650 lithium ion rechargeable battery with MICRO-USB port for ease of charging – no charging cradle needed When plugged into a power source, two LED indicators display the current charge state: Red for charging and Green for fully charged 3,500 mAh for extended battery runtime 8-10A discharge rate for dependability in high drain devices such as LED flashlights Key Attributes Type: Protected 18650 Voltage: 3.6V Certification: CE, PSE, UN38.3 Charge End Voltage: 4.20V Chemistry: Lithium-ion Dimensions:: 69.4 x 18.6 mm Discharge End Voltage: 2.50V Discharge Rate: 8-10A Energy: 12.6 Wh Lithium Content: 10.5 g Operating Temp Range (Charging): 0-45ºC, 65%±25%RH Operating Temp Range (Discharging): -20ºC-+60ºC, 65%±25%RH Rated Capacity: 3.5Ah Standard Charge Rate: Charging through USB can take over 8 hours if fully depleted. Approximately 5 hours of flashlight cutoff Storage Temp Range: 0-35ºC 60±25%RH USB Current: 600mA ± 100mA USB Charge Voltage: 5.0V ± 0.2V Weight: 1.7 oz (49 g)