Displays wrong

When this indicator only used, so you have a permanently installed "box" in which you can plug in the charger, it is good. But if someone put a point to read the battery charge here, this is the wrong device. It always lights actually the red diode, even when the battery is full. Only by prolonged charging with infected charger, the green LED lights up. Subtracting from the charger, immediately lights up the yellow LED, a short time later the red.