Q: I read your column every week and have learned a lot. Thank you for all the info. I live in Chicago and have a deep-cycle battery for my pop-up camper that I keep in my unheated garage between trips. I have it on a maintenance charger. Should I bring it indoors during the Chicago winter, or will the charger keep it ready (and undamaged) for next season? E.Y., Chicago A: The charger will be all you need.