Lefoyxxx

The thing you are missing is that when you attempt to start your car, you are not making a short circuit. Consequently the current will be substantially less. A jump box that lists a peak current in a short circuit is misleading.

Your mind is clearly made up and nothing 8 say will change it. Have a merry christmas.

christcorp

I never once disagreed with you that the amperage rating by the manufacturer is misleading. I agree totally. The only thing we disagree about, is that you believe the most amps you can pull from a jump starter is about 200-220 amps. I believe you can draw more and the voltage hasn't drop too far by which you can "assist" in jumping a car. We both understand P=IxE. All is good.

Lefoyxxx

Unfortunately your belief is based on conjecture. Mine is based on
Actual tests and forty years of designing similar devices.

Go buy yourself a Harbor Freight load tester and see for yourself. The load tester simulates a real world load. Not inflated Madison Avenue numbers.

christcorp

On a parallel point, if a person is interested just in a jump starter and doesn't need an air compressor/light combo, ultra-capacitors work really well instead of a battery. light weight, lasts almost forever, environmentally friendly. Price is about the same as a jump starter (To buy or build yourself) but you don't have to buy a new one in a year or two.