All LED rows light up = full charge
4 rows of LEDs light up = approx. 2/3 charged
2 rows of LEDs light up = approx. 1/3 charged
2 LED rows flashing = low battery level, please charge
A white LED lights up on the handle: soft, minimum suction power
Two white LEDs light up on the handle: med, medium suction power
Three white LEDs light up on the handle: max, maximum suction power
LEDs rise = battery charged, but not yet working
All LEDs are extinguished = battery is fully charged