Is your car kept in a heated garge, unheated garage , or outside? How far do you drive?
Google it or talk to your local CarQuest/O'Reily/Napa. I think they come pretty cheap, and some can be installed under the hood and plugged in like a block heater. If outside, a battery heat cover may help, also. Cold batteries lose much oif their cranking power.
Just remember to unplug it when you leave .......
I've been thinking of getting a shop model for my RV/Boat batteries, which are just out sitting on the bench in the heated garage. Topping them up every month or two is not really that much of a PITA, so I've been putting it off.... but old age is for lazy.
Our vehicles are kept in a heated garage, and it's about a 10 mile OW trip to town, That seems sufficient to keep the batteries up, tho I may put one and a battery cover(s) in the Expedition, for winter trips to the Interior, when the car has is kept out overnight in temps to -50. Block heater plugged in if possible.
So far, no problem, but I told my wife we are not going to go "camping" in a rental cabin without electricity again as we did last year. (-35) Getting up every 3 hours to warm the car and stoke the POS wood stove is for the young and/or foolish.
OK, I'm late to the party while typing, I see.
