Philips HX 7351 - Manual (Page 6)

1 Make sure the bottom of the handle sits back securely in the charger
so that it makes complete contact.
The handles of other Sonicare models do not fit in this charger
and will therefore not charge effectively. Do not attempt to force a
handle into this charger, as this will cause damage.
Battery-low indicator
When the battery is running low, you hear 3 beeps after the
Smartimer has switched off the toothbrush. In addition, the bottom
LED blinks yellow for 30 seconds.
When you see and hear the battery-low indication, 3 or fewer 2-minute
brushings remain.
Keep the Sonicare in the plugged-in charger when not in use to maintain a
full battery charge.
multiple-lED charge indicator
When you place the handle in the charger, the green charge indicator
LEDs blink in a rising pattern as the battery charges. The number
of blinking LEDs indicates the level to which the battery has been
charged.
When the battery is fully charged, the LEDs stop blinking and start burning
continuously. About once a minute, the charge indicator LEDs go out
briefly and then go on again. This indicates that the battery is maintained
at full charge. The full-charge indication persists until you remove the
handle from the charger.
using the appliance
useful tips
The brush head comes with a convenient travel cap. Remove the
travel cap from the brush head before you switch on the Sonicare.
Rinse the brush head and bristles after each use.
Clean the brush head weekly, including under the nut.
A fully charged Sonicare allows you to brush your teeth for 
minutes twice a day for approximately  weeks without charging. This
makes it easy to travel without the charger.
Voltage converters and plug adapters DO NOT guarantee voltage
compatibility. Always check for voltage compatibility.
Brushing technique
Follow these simple steps to maximise your brushing experience.
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