1) Nonlinear super power constant current switch of intelligent charger 
2) In a certain voltage, the battery of charger can maintain a constant current, and can control itself hen the battery is full 
3) Charging current: 
-Battery voltage under 3.4V, current 850-900mA 
-Battery voltage to 3.5-3.6V, current 650-700mA 
-Battery voltage to 3.9-4.1V, current 500-550mA, up to the full of battery, rate of 98%-100% 
4) The charger with anti-battery-inversion circuit ensure the safe of the charger and the battery 
5) Recharge ability: 16340 / 18650 / 25500 / 26650 / 26700 battery 
6) Charging time: 4-5 hours 
7) Size: 145 x 67 x 40mm