maybe just bring it inside and set it near a heater for awhile then hook it up and let it charge off the other car for a few before cranking?
2014 Patriot Latitude
2006 GMC Sierra 1500,reg.cab, short box,4x4,mostly stockTraded in
1994 ZJ 2" BB,31" TrXus MT-sold and have regretted it ever since :(
2002 Subaru Impreza 2.5RS w/ too much to list here
1994 Toyota 4Runner-I couldn't destroy it but the rust was making good progress-Traded in.