I originally had the standard plastic charger which worked well until fan failed.
having just charged using old charger I was surprised to see that when I connected this new unit it charged for about 4hrs longer. well made unit feel much better quality. I have a BBS02 750w & 13.5ah battery, I ride set to level 2 yesterday many hills in my area also I did 25 miles and was only just starting to flash at 3 bars, I have done 30 in the past will still lots left. this is a slow charger so allow most of the day to recharge which is fine by me only doing one ride a day.