Yes the mah is bottom left and amp is bottom right i use 750 mah battery witch can charge and discharge upto 0.7 amp but I set mine around 0.4-0.5 amp to be on the safe side
Eg : 100 mah = 0.1amp charge/discharge
200 mah = 0.2amp
300 mah = 0.3amp
And so on
Sorry its a bit longwinded but put them on a discharge setting once they are discharged then charge them fully and take notes on the mah that the battery has taken from a discharged state that should give the capacity of each battery
Eg if it's a 500mah battery but only takes a 300mah charge...
That type of charger don't fully charge the battery they seem to charge 1 batt full but the rest just get some charge normally 1/4 to 1/2 charge have you tryed charging 1 battery at a time as 1 had the same type of charger but now I have an imax b6 so I can balance charge upto 6 batteries at once