I renewed my car AGM battery with a DC welder. try this at your own risk
Welder
https://amzn.to/3MxMlwq
Charger
https://amzn.to/34pu9UM
Load tester (better than what I use)
https://amzn.to/3MpKudj
Solar charge controller and panel (I like to use solar to keep batteries topped off when not in use)
https://amzn.to/3hIKgzQ
https://amzn.to/3hOWHKi
Keep an eye on temps
https://amzn.to/3pNbE3U