Philips intelligent remote control - Manual (Page 7)

Introduction 5
6 Place the Remote Control on the recharging dock.
Recharging starts automatically. The light on the front of the recharging dock
indicates charging takes place. When the battery pack is fully charged, the
light goes off.
Notes
You can operate the Remote Control while it is being charged.
Normal charging time is 2 to 3 hours, depending on the condition of the
battery pack.
When the battery pack is running low, the Low Battery icon flashes at the
center top of the display. Recharge the batteries as soon as possible to ensure
perfect performance.
Note
The Remote Control retains all settings when the battery pack has run out.
You will only have to reset the clock.