IMO what matters most about these jump packs isn’t Brand X or Brand Y, it’s:
1. Have it with you when you need it.
2. It has to be CHARGED when you need it.
For #2, I put a recurring reminder in my phone. I charge them once a month during the winter and every other month in the summer. Seems to work great and they don’t require much charging when I do it on this schedule.
I’ve got 2 different brands 1 from NAPA, one from Amazon and I got my dad one for Christmas. All are about the same so far, I think I’ve had them 2-3 years.
I’ve used mine 3 times, all were “dead in parking lot” situations, all 3 times the battery pack jumped the car/suv easily and it started right up.