F4easy

Hey guys, I bought the MB battery charger and trickle charger for my 06 cls and was curious on how to do it. I have the clamps for battery and cigarette adaptor as well. I was gonna use in winter when car sits, should I use on main battery with clamps for a few days and then cigarette adaptor in trunk for second battery and switch back and forth? Or jus leave on main battery? Thanks everyone