you might also want to check and make sure your light isn't staying on in the fridge. Sometimes if you move a shelf (depending upon the fridge) that affects the switch that is supposed to shut off the light when the door closes. That light draws alot of power....
I suspect by the sounds of it you have a low battery or a bad cell, a single 12 volt with only the fridge & the CO detector etc should go three or 4 days. Add another 12 volt and you can go a week....
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