Always make sure that you place the appliance onto the charger properly. If your Philips DailyDuo Vacuum Cleaner is placed properly, the charging light will come on to indicate that the appliance is charging. When the appliance is fully charged, the charging light goes out. Note: You can leave the appliance on the charging base, even when it is fully charged. Every 5 minutes, the charging light lights up for 3 seconds. This indicates that the appliance is checking if the batteries are still fully charged. Note: If you put the appliance on the charging base while it is switched on, the appliance switches off automatically after 2 seconds.