RE: RC Car Jerking.. Is this normal ?
Yeah, most chargers require a 12v DC power supply. They do this so people can run them off their 12v car battery when at the field. So, if you want to use it at home, you have to come up with a 12v solution. The charger you got is only 50w, so you only need a supply that will deliver around 6A @ 12v. Even then, 6A is a bit much to ask for a normal wall-wart power supply. Either convert a PC power supply, or get a retail one.