Philips CD1811R-NL - Manual (Page 7)

Charge your phone
Charge 8 hours
Place the handset on the base station to charge the handset. When
the handset is placed correctly on the base station, you hear a docking
sound.
The handset starts charging. »
Note Charge the batteries for 8 hours before first use.
Check the battery level
When the handset is off the base station/charger, the bars
indicate the battery level (full, medium and low).
When the handset is on the base station/charger, the bars
flash until charging completes.
The empty battery icon flashes and you hear an alert tone.
The battery is low and needs recharging.