5 LEDdisplayforbatteryenergylevelfrom20%to100% 0% LEDFlashing for singelcellvoltage 3V（mustrechargebattery）1 LED=20% for singelcellvoltage:3.0-3.3V（batteryneed recharging）2 LED=40% for singelcellvoltage:3.3-3.5V3 LED=60% for singelcellvoltage:3.5-3.8V4 LED=80% forsingelcellvoltage:3.8-4.0V5 LED=100% forsingelcellvoltage:4.0-4.2V (batteryisfull)