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Features and Benefits Unique and New! With PCB protection! Li-Ion 18650 cylindrical rechargeable batteries with Internal Voltage protection PCB! Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V. Unique PCB design and patent pending. 3.7V 2600mAh high capacity High energy density and lower weight than other rechargeable batteries Manufactured under ISO9001-2000 to assure quality Battery tested based on International Electrotechnical Commission (IEC) standard to ensure capacity, quality, and life time Applications Lighting or other device needs 3.7V power Building portable power device that needs high energy density and low weight Product Specifications Capacity* Nominal 2600 mAh, Minimum 2450 mAh Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V. UNIQUE INTERNAL PCB! Dimensions: - Diameter 18+/-0.2 mm - Height 66+/- 0.2mm Weight (Typical) Approx. 46 g Nominal Voltage: Average 3.7V Cut-off Voltage: 3.0V Internal Impedance: less or equal to 180 milliohm (with PTC) Cycle Performance: 90% of initial capacity at 400 cycles Cycle life: > 500 cycles Charge: Current = 0.5C mA Voltage = 4.2 V End Current = 0.01 mA Discharge: Current = 0.5C mA End Voltage = 3.0V Max. Charging current: 1.5C ma Max. Discharging current 1.5C ma (for continuous discharge) Warning CAUTION: when working with Li-ion cells, they are very sensitive to charging characteristics and may explode if mis-handled. User should have enough knowledge on Li-Ion rechargeable batteries in charging, discharging, and assembly before use.