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I don’t know how your previous batteries lasted months without being plugged in. My CO detector will drain the battery within two weeks. If you don’t disconnect the negative battery cable, it will kill the batteries. Your CO detector is probably your parasitic drain.
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Don and Kathleen
2019 Montana 3791RD 20th anniversary.
2014 Ram 3500 Dually CC, CTD, Aisin “Kasper”
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