4 pcs Tenergy Li-ion 18650 Cylindrical 3.7V 2600mAh Rechargeable Batteries (Button Top) with PCB for Flashlights and Others
Applications    * Lighting or other device that needs 3.7V power    * Building portable power device needing high energy density and low weightWarning    * CAUTION: when working with Li-ion cells, they are very sensitive to charging characteristics and may explode if mis-handled.    * User should have enough knowledge on Li-Ion rechargeable batteries in charging, discharging, and assembly before use.    * Put the batteries in fire-proof container    * Do not put batteries on wood surface or carpet when charging    * Never leave battery un-attended when charging    * We are not responsible for damage of any modification of the batteries in form, shape or made into packs    * We are not responsible for any damage caused by misuse or mishandling of these Li-Ion batteriesProduct Specifications    * Capacity* Nominal  2600 mAh, Minimum 2500 mAh    * Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.35V.  UNIQUE INTERNAL PCB!    * Dimensions:        Diameter: 19 mm        Height: 69.5 mm    * Weight (Typical) Approx. 50 g    * Nominal Voltage: Average 3.7V    * Discharge Voltage: 3.0V    * Internal Impedance: less or equal to 130  milliohm (with PTC)    * Cycle Performance: 90% of initial capacity at 400 cycles    * Cycle life: > 500 cycles    * Standard Charge Current: 0.2C (Cut-off Current: 0.01C)    * Fast Charge Current: 0.5C (Cut-off Current: 0.01C)    * Standard Discharge Current: 0.5C (End Voltage = 2.75V)    * Max. Discharge Current: 1.5C## Please check Tenergy 2-Channel 18650/14500 Li-ion Battery Charger for better compatibility:http://www.amazon.com/gp/product/B004HGM4YI