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on the top it had a sticker with 750 on it so I assume they are 750 amp hours. Does that sound right?
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That's probably "CCA" or "Cold Cranking Amps" rather than Amp Hours. CCA has more to do with starting your motor on a cold morning.
Ah on a Group 27 deep cycle would be more around 90-105ah, if memory serves me (it doesn't always :-/ )