My basic question is I have a Intellea peak charger and I have ni-hm and ni-cd batts but my ni-cd batts make my car travel about 1.5 times faster. useing a 10x2 motor. I have a 15x3 and a 12x3. I did not know if there was something I can test to see if the ni-hm are bad but I have 6 of them and all perform the exact same maybe a mile an hour off. Since the radar gun does not acuretly give you anything below 35mhs I can not tell you the exact but it is around 28-29mhs for the ni-hm and I know the ni-cd is 46-49mphs peak. Volts of the ni-hm are 8.5 and they are the 3000mah but when in operation it drops to 7.02 volts. the ni-cd paks are 7.6 and 2000mah drops to 6.9 volts when running car. I always drain the bats with the charger in the discharge mode then fast charge the pak at 6.5 peak charge amps. The batts are kept kewl and never really get above 50 degrees while chargeing. oh reason is I have a freezer everything is installed into. Oh if anyone wants to know what gears I have for the 4-tec it is 21t pinion and stock spur.