check the charger, may be staying on longer than needed. once any deformation starts the deterioration comes on pretty quick. if the charger connectors are also deformed it started there. if the batteries are too hot to touch with sensitive skin the chargers are over charging or the batteries are defective. i have seen this problem begin when chargers were moved to a 240 source when set up for 208, can also be wrong AH rating you must change all three even if it means cable replacement on the truck side...good hunting.
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