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
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Welder
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Charger
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Load tester (better than what I use)
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Solar charge controller and panel (I like to use solar to keep batteries topped off when not in use)
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Keep an eye on temps
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![](https://i.ytimg.com/vi/pT3h7Whv8JQ/mqdefault.jpg)