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Discussion Starter #1 (Edited)
It was -38F last week and I didn't start my car once. Eventually the 5 years old battery is dying on me. The dash will display "battery low start engine now" if I turn the ignition key to the ON position for 3 minutes or less.

I don't have a 9V memory saver to keep my radio and other settings alive before I pull the battery. Can I connect my 12V battery charger to the positive and negative post under the hood to keep the juice flowing before I disconnect the battery and swap it out with a new one?

Many thanks.
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