Epoch 18650 3500mAh 10A - Protected Button Top Battery NOTE:  This battery is 70mm in length, please make sure the added length will be compatible with your needs.  This is ~5mm longer than a standard 18650. Specifications: Manufacturer Epoch Batteries Model 3500-PCB Size 18650 Positive Terminal Button Top Nominal Capacity 3500mAh Continuous Discharge Rating (max) 10A Nominal Voltage 3.7V Maximum Voltage 4.2V Discharge cut-off Voltage 2.5V Protected Yes. over-charge, over-discharge protections. Rechargeable Yes Approx. Dimensions 18.35mm x 70.05mm Approx. Weight 49.07g WARNING: The user must have appropriate understanding of lithium ion batteries before purchase.  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. Buyer is responsible for any damage or injury caused by misuse or mishandling lithium ion batteries and chargers. 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. DO NOT USE WITH E-CIGARETTE, VAPORIZER, OR SIMILAR DEVICE 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 before purchase Usage of batteries is AT YOUR OWN RISK