Without being too alarmist, but is the alternator okay, sometimes when they are on the way out they can act like an electric motor and drain your battery even when the engine is off. Have you checked by disconnecting the positive terminal and bridging the battery terminal to the lead with your multi meter, you should not have a high reading voltage wise if you do it's time to investigate the drain. Check alternator output on tick over and again at half revs, if it's around 14.5 you're okay.
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