Samsung 40T 21700 4000mAh 35A Battery - INR21700-40T (40T3) NOT FOR USE  IN E-CIG OR VAPE Alternative option: Molicel P42A 21700 Battery Samsung has really hit some "Grand Slams" just in the past couple of years with Li-Ion cells, this Samsung 40T is just one of those examples. What makes this cell so special is it's ability of having "Maximum Balance" with Very High Capacity and while having Ultra-High Discharging/Drain capabilities without any compromise, this was previously thought to be impossible as you have only so much room in a cell for either Capacity or High Drain, Not both. Samsung has become the leader in the R&D department as of lately, this Samsung 40T is just one shining example of that. Having a legitimate 4,000 mAh in capacity with a 35 Amp True Constant Discharge Rating without involving a temperature limit cutoff and not making the cell over worked, is nothing short of Amazing.  This is the hardest initial hitting cell made that has a legitimate 4,000 mAh or greater in capacity. With this cell you can have a true "Peace of Mind" that your demanding needs and wants will be more than satisfied and met with no problems. This is a truly a Phenomenal cell in the 21700 form factor size. Specifications: Manufacturer Samsung SDI Model 40T (3) Size 21700 Positive Terminal Flat Top Nominal Capacity 4000mAh Continuous Discharge Rating (max) 35A Nominal Voltage 3.6V Maximum Voltage 4.2V Discharge cut-off Voltage 2.5V Protected No Rechargeable Yes Approx. Dimensions 21.1mm x 70.4mm Approx. Weight 68.7g Country of Origin Republic of Korea Associated Names INR21700-40T Data Specification Sheet Samsung 40T (3) Datasheet 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