When should I charge my Sonicare ExpertClean?

Battery Status (handle on plugged in charger)
When the handle is placed on the charger, sanitizer or travel case , the battery light will flash green based on the current battery level.

Number of Flashing LEDs =Battery charging status (level)
1 LED = Low
2 LED's = Medium
3 LED's  = High

Note: When the handle is fully charged, the three battery indicator lights light up green. After 30 seconds the battery indicator lights switch off.

Battery Status (when handle is not placed on Charger)
When removing the handle from the charger, sanitizer or travel case, the battery light at the bottom of the handle will indicate the status of the battery.

Number of LEDs & Color = Battery status (level)
3 Solid Green LED’s = High
2 Solid Green LED’s = Medium
1 Solid Green LED = Low
Flashing Amber 1 (with beeps) Empty or near empty