Yes.

This appliance contains NiMH batteries that have to be charged longer the first time (or after a long period of disuse) to reach their full capacity.

If you charge it roughly 3 times longer than the normal charging time, this will optimize the battery life of your shaver.

For optimal performance, only charge the shaver when the battery is low.

See also: 'How long does this shaver need to be charged?' for the normal charging time of your shaver.