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Think a battery disconnect switch would be my first fix. Then let them fully charge for a couple days on your external charger. Bring them up to full charge (check with a external hand held meter About $10) and then check them a few days to a week later.
If they are maintaining the charge, it's not the batteries. If they are drained significantly, you may have a couple bad batteries although it's unlikely since you were having similar problems with the 12v batteries. Willing to bet it is your radio and the CO/Propane and smoke alarm all drawing power along with any 12v llight or another 12v draw somewhere your not aware of that you may have left on. Even if there is no light on, those 4 items drawing could potentially be enough to drain your batteries in a few days.
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