The HQ488 shaver can be recharged in 1 hour by means of a ’Fly Back Self Oscillating Power supply’. This electronic circuit enables the cell to be charged at 100-240 V, 50/60 Hz. It is possible to have a shave directly from the mains. The green LED only illuminates when the shaver is connected to the mains. The electronic circuit incorporates the following functions and controls: - a 1200 mA Quick Charge supply. - a 35 mA Trickle Charge supply. - a 1.25 V / 2.1 A Dynamic supply when shaving from the mains. - an open cell protection (Vbat >1.8V). - a temperature protection of the cell. (if Tcell - Tamb >7C, charging will switch-over from Quick Charge to Trickle Charge).