Sony's BCG34HRE4K Super Quick Power Charger with Refresh Function and AA 2,000mAh Ni-MH CycleEnergy Blue Batteries
The Refresh function is a function that will eliminate the ?memory effect? left over by a battery that has been charged without first being fully discharged. The ?memory effect? is a temporary voltage depletion caused by charging and discharging a battery without the battery ever being fully discharged. The ?memory effect?, which will shorten the usable time of the battery (the operating time of the equipment), can be observed when the operating life-time of the equipment in which the batteries are placed decreases over time. With the unique Refresh function, you can renew the original usable time of the battery by fully discharging it. The impact of the ?memory effect? varies depending on the equipment in which the batteries are being used. You do not need to refresh a battery before each charge. Only refresh a battery when you notice the usable time of the battery on a particular piece of equipment shortens.