I reconditioned a battery that sat for years, this battery was 9 years old and is completely usable now


This link is the battery load tested after fully charged
   • Battery reconditioned with a welder a...  

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