Fast charger for use of troubleshooting, this is the impression it makes me ... Charging the battery nimh 750 mah mah 2400 in fast mode, ideal when it is pressed, but less interesting for long-term durability of the batteries. Similarly, when the batteries are discharged too charger do not take care of ... Therefore obligatory slow charge to recover (with another charger obviously) In fact the advantage of this type of charger is undoubtedly responsible for the speed, I confess that I prefer a slower charge, but when pressed it is really ideal, So I alternate fast charge and trickle charge after kick ... I recommend