The Modlite 18350 1200mAh Battery features IMR cells. 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. FeaturesMinimum Capacity: 1100 mAhTypical Capacity: 1150 mAhNominal Voltage: 3.7VCharging Voltage: 4.20VStandard Charging Current: 0.22AMax Charging Current: 1.1ADischarge End Voltage: 2.5VMax. Continuous Discharging Current: 8AProtection Circuit