RE: wall charger and 6V - NiMH battery
Common on people, in the past wall chargers That came with transmitters had an extra port to charge NiMh batteries, it is trickle charge so you have to leave it overnight. But it works.
I change now to LiFe for my receiver packs, but when I was using NiMh never had a problem charging them overnight w the wall charger the transmitter came with.