Equipment to buy for jumpstarting a PiP

It's not bad, but wouldn't be a good test?

I would focus on chargers and testers, before jump starters, my 2 cents.

 

Same here. If you can only get one right now, I'd get a quality charger. I've never ever owned a jump start battery and never regretted it. But there was one time in my 64 years of life when it would have been handy, but not essential. The other two times I needed a jump, it was -23F and -30F and that's when I learned that it was time for new batteries because those batteries were frozen.