I’d use an external charger to try to bring them back (after checking water level if not a sealed battery).
Smart chargers can have an issue charging batteries that were discharged too low... they can’t get enough of a voltage reading to determine what to do...
An hour or so on a ‘dumb’ charger can bring them up enough for the smart charger to take over... sometimes.
Still have my Craftsman 2/10/50a ‘dumb’ charger for that purpose.
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Greg
Not yet retired...
Florida (Michigan transplant)
2014 Hurricane 32A
2000 Infinity (previous)
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