FWIW On an 08si, I disconnect the negative terminal and come back in five months. Hook up terminal, fires up like usual and I drive off. Cause I have a roadster I have to re-initialize the windows, but that's it. I am told the cold temperatures greatly reduce the discharge rate over time. When I get home(for no particular reason) I charge battery with the 10/2/.75 amp. It charges an hour or so at 10 then bumps down to .75. Original battery.
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