The batteries aren't probably in all that bad a shape. A fully charge 12 VDC bank, even one made up of four T105 GC batteries, in two sets of two, will only be 12.6-12.7 VDC at 100% charge. Depending on what kind of lights and stereo you have, it could very well be that you drop them from 12.6/7 to 12.3 volts in two hours.
Letting them dry out was probably not very good for them. What I would recommend you do before biting the bullet and buying new batteries, is to get a good hydrometer and charge the batteries fully, then disconnect the cables and let them sit for an hour or so... then check the individual cells to see what the specific gravity is of each cell. If they're all about the same and come up as fully charged... They're probably okay. It might be that one of the batteries has a bad cell, and that would bring all four down rather quickly.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.