FWIW, the Wirecutter recommends the Weego line of portable jump chargers: https://www.nytimes.com/wirecutter/reviews/best-portable-jump-starter/#the-competition

What catches my eye about this line of chargers is the genius bass-ackwards design of the clamps: all of their chargers have this design - they look much easier to squeeze open, esp. for those with smaller and/or weaker grip strength

They recently came out with a (gulp) $400 1200 amp charger that might start up a Caterpillar backhoe.

Their chargers have a flashlight, and options to charge phones, etc.

I have not bought one, no financial affiliation; but might ask for one for Christmas.

Wirecutter reviews a wide array of stuff, some of which is of interest to ETS members.