Rodney

You cannot use a peak detecting charger to form charge. You need a constant current input as close to 0.1C as you can get and then put in at least 150% of capacity (like 15 to 16 hours at 0.1C). If then discharging to determine capacity, you would discharge at 0.3C down to 0.9 volt/cell. If you discharge at a higher rate or fail to discharge down to 0.9 volts/cell, you will get a lower mah reading.