You have done exceedingly well, if lead acid has lasted 6 years.
Or, your charging is good and loads have been lights, and its never cold where the batteries are kept, and they are never overloaded.
Measure freshly charged batteries voltage individually.
Likely, some have low voltage vs what they should have.
If that is the case, they (as a rule) need to be replaced as a set.
On a more practical bent, acids, flush etc. tricks can eek out maybe one more season from them- with risk of failure just when you needed them.
Li-ion is a better alternative, today.
Otoh, if they have served your needs, and you were happy with them, that is proof its a good solution for You, asi-is, where is.
Better is the enemy of good enough.
-- -hanermo (cnc designs)
Posted by: Hannu Venermo <gcode.fi@gmail.com>
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