[GMcKenzie]

Couple options to load test it. Once it is charged, take it to pretty much any auto supply store that sells batteries and they will test it for free. Or buy a load tester like

https://www.walmart.com/ip/Schumache...ester/21642133

and test it yourself.

Slides generally won't work if you don't have a battery hooked up. They draw more amps than the converter can put out.