How do I know if my battery needs to be desulfated... symptoms....

[Chopperbobc]

What percent state of charge and for how long before the battery sufates.... example 50 present, 30 percent 10 days....ect

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[HeyBales]

https://www.batteryuniversity.com/article/bu-804b-sulfation-and-how-to-prevent-it/


There are two types of sulfation: reversible (or soft sulfation), and permanent (or hard sulfation). If a battery is serviced early, reversible sulfation can often be corrected by applying an overcharge to an already fully charged battery in the form of a regulated current of about 200mA. The battery terminal voltage is allowed to rise to between 2.50 and 2.66V/cell (15 and 16V on a 12V mono block) for about 24 hours. Increasing the battery temperature to 50–60°C (122–140°F) during the corrective service further helps in dissolving the crystals.

Permanent sulfation sets in when the battery has been in a low state-of-charge for weeks or months. At this stage, no form of restoration seems possible; however, the recovery yield is not fully understood. To everyone’s amazement, new lead acid batteries can often be fully restored after dwelling in a low-voltage condition for many weeks. Other factors may play a role.

A subtle indication whether lead acid can be recovered or not is visible on the voltage discharge curve. If a fully charged battery retains a stable voltage profile on discharge, chances of reactivation are better than if the voltage drops rapidly with load.

 

[Cherokee]

And for AGM batteries the Noco Genius 1 for $30 at Walmart de sulfates automatically while charging.
It’s called ‘Pulse’ charging I think,
Old/new tech, the automatic desulfate chargers have been around about twenty years now.

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