Depends upon how far discharged they were. Since this happened in storage, best guess is that they were severely discharged. If the voltage was down around less than ten volts, they may be toast. Charge for 24 hrs. remove from charge source, wait a few hrs. then check voltage. If the voltage is down under 12v at that time, it's new battery time.
Happened to me. Now I manually disconnect batteries both house and chassis in storage.
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Making a smooth transition to senility for over 70 years
2017 Freedom Elite 29fe
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