This is the one I bought when I was going through that with my '17. During the beginning of the pandemic, I wasnt driving and it would die every 2 or 3 weeks.. Jumped it many times.

https://www.amazon.com/gp/product/B015TKUPIC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

There are lots and lots of choices. Anker tends to make better products but more expensive.

Here are a couple that I have:

this is a monster battery, roughly the same size as an iPhone Pro Max only thicker, lasts forever before you need to charge it again. I often forget to charge my battery so this comes in handy. It can charge other devices such as your laptop and phone of course at the same time.

If you want something even more multi-use, consider the NOCO portable car battery charger , it can charge all your devices plus charge your car battery and has a flashlight. NOCO’s are usually the de facto standard for portable car battery chargers.

This isn't essential for prepping but it is such a damn good value, for $35 you get an ozark Multiforce multitool from Walmart which has been reviewed as being better than the Leatherman Wave+ which usually retails for about $100.

Battery bank and/or NOCO jump starter (1000 Amp should be plenty unless you know their vehicle requires more: https://www.amazon.com/NOCO-GB40-UltraSafe-Lithium-Starter/dp/B015TKUPIC/ref=sr_1_1_sspa?dchild=1&keywords=noco+jump+starter&qid=1608418658&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyNFNLQkxESU9MNlJZJmVuY3J5cHRlZElkPUEwNjQ0Mjg3MVpDU1E0SElVV0wxTyZlbmNyeXB0ZWRBZElkPUEwNDE3ODA3MThZUzlQQzAwWks1NSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=)

Last Suggestion: silver/gold what prepper doesn't love silver/gold either coins or bars works.