KeepPower 18350 1200mAh Protected Button Top Note: Cells come from KeepPower in a package with two cells and a plastic storage case. You will receive two cells when you choose a quantity of one. Here is what separates IMR cells from standard Li-Ion: IMR cells are a specialized Li-Mn (Lithium Manganese) chemistry specifically designed for high-drain applications. While they excel at delivering massive discharge rates, their capacity is much more limited than a Li-Ion of the same size. The KeepPower 18350 is the highest capacity IMR battery in this size, but it will only deliver 35 minutes of run-time on the highest power setting in an PLH or OKW light. These cells are what we include when you purchase a complete 18350 size light from us. They are a traditional button top which makes the cells easy to identify positive and negative at night in the dark or under NODs. We also offer a non protected version flat top version of this cell that has an 8amp current limit here. We recommend the protected cells but for those of you comfortable with handling batteries the non protected cells to offer a bit more current. Specifications: Minimum Capacity: 1100 mAh Typical Capacity: 1150 mAh Nominal Voltage: 3.7V Charging Voltage: 4.20V Standard Charging Current: 0.22A Max Charging Current: 1.1A Discharge End Voltage: 2.5V Max. Continuous Discharging Current: 8A Protection Circuit (Against over charge, over discharge, over current and short-circuit.) Dimensions: (L)39.0mm*(D)18.6mm Warnings: -Do not overdischarge/overcharge -Recharge drained batteries ASAP -Do not short circuit -Do not dispose of in fire -Do not expose to extreme heat or water -Please be familiar with handling lithium-ion batteries before purchase. Please note: Due to the nature of this consumable product, no returns are allowed unless the product is defective upon receipt.