hi ya
I know this is going off topic a bit, but I fell into the same trap as a lot who purchase through the net, with regards to buying a battery charger - look for the cheapest with the best name. At the time I was entering into the field of lipo batteries and brushless motors; so needed a battery charger that would charge up lipos and at the present time it charges the lipos okay, as I have checked the lipos with a little plug in meter which plugs into the end of the lipo batteries and checks the cells and the balance and they have charged okay. Also, it charges the standard Ni-MH batteries no problem, so - so far - so good.
Still doesnt answer the problem with these speed controllers though - but definitely sound suspect to me. i.e. copies. Maybe someone should send one to MTroniks cos no doubt they could open one up and know what to look for inside and possibly give a good answer.
aye
john