Epoch 25P 18650 2500mAh 20A Battery Grade A - sorted with matching voltage, resistance and capacity.  Specifications: Manufacturer Epoch Batteries Model 25P Size 18650 Positive Terminal Flat Top Nominal Capacity 2500mAh Continuous Discharge Rating (max) 20A Nominal Voltage 3.6V Maximum Voltage 4.2V Discharge cut-off Voltage 2.5V Protected No Rechargeable Yes Approx. Dimensions 18.25mm x 65.05mm Approx. Weight 42.73g WARNING: The user must have appropriate understanding of lithium ion batteries.  Use caution when working with and using lithium ion batteries as they are very sensitive to charging characteristics and may explode, burn, or cause a fire if misused or mishandled. Always charge in or on a fire-proof surface. Never leave batteries charging unattended. Charge only with a smart charger designed for this specific type of lithium ion battery. Do not mix and match old and new, used and unused batteries. MISUSING OR MISHANDLING LITHIUM ION BATTERIES CAN POSE A SERIOUS RISK OF PERSONAL INJURY, PROPERTY DAMAGE, OR DEATH BATTERIES MAY EXPLODE, BURN, OR CAUSE A FIRE IF MISUSED OR MISHANDLED ONLY USE WITH PROPER CIRCUITRY IN A PROTECTED BATTERY PACK ONLY USE WITHIN MANUFACTURER LISTED SPECIFICATIONS DO NOT STORE LOOSE BATTERY IN A POCKET, PURSE ETC. - ALWAYS USE A PROTECTIVE CASE OR BOX KEEP AWAY from metal objects to prevent short circuiting DO NOT short circuit DO NOT use if wrapper or insulator is damaged or torn DO NOT use if damaged in any way DO NOT overcharge or over-discharge DO NOT modify, disassemble, puncture, cut, crush, or incinerate DO NOT expose to liquids or high temperatures DO NOT solder, spot weld only User must be familiar with handling lithium ion batteries