comments:
Jump n Carry is one of the gold standards. I would just buy one of those. I have one and it’s great, just big. Noco is also great https://a.co/d/00ABwuFa
https://a.co/d/0eAGOqx0 - Amazon ilnk
Don't use the EV 12-volt directly, but instead you should take advantage of your huge battery to charge a portable jump starter!! If you need to jump start someone just carry one of these portable chargers in your subtrunk: https://a.co/d/0aIwcQl4 They charge via USB-C, so it's come in handy many times when I need to jump start my parents' cars.
That's a great option for when you are home but if you're out and about you're looking for something closer to this amazon
Good thing Prime Day starts in a few hours. Get one of these and keep it in the front of the car, not trunk: https://a.co/d/00TUWoK5
Btw, NOCO calls it a starter, jump starter. https://a.co/d/0bDFCQis
The thing is, a battery has less of a preemptive need to be replaced if you plan ahead a bit. There's the obvious where you sign up for a roadside assist and get a jump start to get home and start the replacement process. Another alternative is to get a battery jump starter. I bought the one below for each of our cars. I have a reminder set to recharge the battery every six months or so. I've used them maybe a dozen times and they work great. https://www.amazon.com/NOCO-GB40-UltraSafe-Lithium-Starter/dp/B015TKUPIC The nice part is that this is a solution for when you accidentally leave your lights on too. Or don't shut the car door all the way so the interior lights stay on. Or, as you're concerned about, the battery starts to go. Might be an alternative that you should look into.