I have one of those jump starters and I can't find the ac charger. It has usb, 110v inverter, cigarette lighter receptacles and air pump.

To jump start a vehicle there is a switch you turn on and it shows the volts on a little read out.

When I had the instructions I think it said it could be charged through the lighter ports from the vehicles lighter port but I'm not sure.

So I thought I would charge it by using a regular vehicle battery charger connected to the jumper clamps with that switch turned on.

Will I mess something up? I mean that's coming straight off the internal battery so couldn't I charge it back through that?

Oh, its welding related because I'll use it to turn on the interior trailer lights when not connected to the truck.