DougE wrote:
I got a GOOLOO GP4000 jump starter lately. It never occurred to me that I could use it in an emergency to power my winch. It's rated at 500a for 5 seconds - not sure what the continuous power output could be.
Most likely will not work without a external battery that is partially charged attached.
Most "jump start" boxes require some sort of battery voltage to be present before they will provide any jumpstart voltage.
Put a meter across the jumpstart leads, bet it will be zero or near zero volts..
The assumption is you have a battery with at least 10V (IE Dead) and the jumpstart box is to be used to provide some starting assistance to get your engine started.
I use an old worn out truck battery which wasn't able to start the truck in middle of winter to run my 8,000 lb winch. As long as the winch is able to pull the load with what you have use it. If you don't feel comfortable with your old battery your using, then buy new battery in the size that fits your vehicle.. Put the new battery in your vehicle and use the old battery from your vehicle for the winch.
If you have a Sam's or Costco membership just buy one of the batteries they sell, they often have better prices than most stores..