Ok I have a few HT600's and a MT1000, I just purchased a new aftermarket battery for it, but how ever when I put the battery in the NTN4633B charger it reads out fault, but it has noproblem charging a reg moto bat. I charged the battery in my converta com unit and that worked, the difference between the two is the aftermarket one is NHMI and the OEM battery is NICD.