Quote:
Originally posted by atikovi
The suggestion to hook up a jump box and give it a while to charge up your battery before trying to start it is wrong. When you hook up the jump box to a bad battery, the bad battery will draw away the current from the jump box so that after 10 minutes you won't be able to start anything. The jump box will have the most power right when you attach it. Connect the jump box, glow, and start as fast as possible.
|
That's what the instructions that came with my portable jumpstarter specifically said to do. I imagine this is because while the jumpstarter has plenty of power, it cannot put it out fast enough in the amounts needed to start our cars (300 or 400 cranking amps just isn't enough). Allowing some of the power to transfer over to the dead battery for a few minutes (assuming it is in rechargable condition and has not gone completely kaput) lets both batteries assist in starting the car.