Charging start batteries in the winter? How do you ??

[luvrbus]

I have the smart charger from DeWalt same as Bruce's Stanley model I leave it on all the time and never had a problem a good charger and tender at a good price IMO 

The Schmacher XMI-5 I bought on a close out sale seem to be doing the job also on the RV I never I had any luck with the Battery Tender