rufe, procedure is pretty much the same, uses a different battery profile than the one in the video. Did a quick search and this was the best price I could find on one.https://www.batteryspec.com/cgi-bin/cart.cgi?action=link&product=33C15&uid=64
I have a jump box I bought at Harbor Freight about 10 years ago.It lasted about 3 years and the battery died.I could buy a new one for about 50 bucks or a good quality replacement battery for about the same price.I replaced the battery and the jump box still works like new.
Thanks to the responders! I was going to buy and install a replacement lead-acid battery. That was until the shipping cost of a new replacement battery came up.
It was going to run $45 total, which I balked at. For only 10 bucks more, I bought one of the new miniature battery jumpers off of Amazon. It's much smaller than the Fat Max, and supposed to put out more amperage.