Thanks for all the replys, has been a great help
Yeah, i sent the charger of to Schumacher and they said the same thing as Rvsinc. If you do V x A = W 14.8 x 3.4 = 50 and thats why its only charging up to 3.4A, but its ok charging my 7.4 V battery V x A = W 7.4 x 5.0 = 37 so that explains it.
Not quite sure why feight's Core charger charges at 5 amps then? Is the UDC 30 rated at a higher Watt?