Ideal for flashlights, LEDs, etc. Keeppower IMR18650 Lithium-Ion Battery (Flat Top) cell NCR18650PF type. Capacity 2900mAh, minimum capacity 2750mAh, nominal voltage 3.6V - 3.7V, charge termination voltage 4.2V ± 0.05V, discharge termination voltage 2.5V, maximum charge current 0.7C 2A, maximum discharge current 3C = 10A, chemical composition LiNiCoAlO2, protection circuit no, positive terminal flat (Flat Top), diameter 18.5 mm ± 0.05 mm, height 65.5 mm ± 0.15 mm, weight 47 g ± 0.01 g, charging method CC-CV. Test results (discharge curve) comparison test detailed test results. Safety notes: Lithium cells should only be operated with protective electronics! Please note that lithium cells may only be used by authorized personnel. Improper handling or short circuits can lead to fire or explosion. Additional features: Lithium-ion batteries are thermally stable and do not suffer from memory effect. They operate on the basis of lithium and are characterized by high energy density. Technical specifications for "Keeppower IMR18650 - 2900mAh, 3.7V Li-Ion Battery 10A (Flat Top)": Normal charge current 1375mA/3h, operating temperature charging 0 °C - 45 °C, operating temperature discharging -20 °C - 60 °C. Notes: Charging lithium-ion batteries requires a special charger that charges the batteries according to a specific charging method (CCCV = constant current, constant voltage). The batteries must not be charged above a voltage of 4.2 volts, as this poses a risk of fire and explosion. It is advantageous to charge the batteries only up to about 4.1 volts, as this significantly increases the lifespan or number of charge cycles (potentially up to doubling). Only lithium-ion chargers should be used for charging. However, cheap chargers often have the disadvantage that they do not safely shut off after the charging process is complete, but continue to charge the batteries with a small current.