My car sits a lot with the alarm on and I had a weak battery during the winter. I have a Shumaker 12 volt 2/12/75 amp charger. The factory manual says not to charge the battery with it hooked up. I guess this means at the terminals under the hood and at the battery behind the real wheel. Has anyone charged at the under hood terminals? Or is it best to unhook the leads from the battery for a charge and hook the charger directly to the battery?