I had everything a battery box having lost their capacity and therefore reformed. this small, smart charger made them in "refresh" a series of charge / discharge cycles, measuring each time the apparent ability until there is more improvement on a cycle other. The all individually recess. and well over 30 unused batteries for 2 or 3 years, he brought me 27-90% of rated capacity. just one point: the entire process is long because in 2500 mAH battery for each cycle lasts 12 hours at the end of charge and 25 hours of discharge. I have therefore ordered a second of these chargers without waiting awesome :) I highly recommend it to all who are struggling to manage a fleet of batteries Ni-MH or other