Cold weather has literally killed my car every winter. I've gone through batteries every year until this year when I bought an Optima Red-Top and haven't had a problem with it yet. Only this year I had to have the starter rebuilt (from a morning of my dad trying to start it without it being plugged in overnight). I learned my lesson.. PLUG IT IN! Also, I've replaced the glow plugs and relay. Solved all my problems.

__________________
1963 Ford F100 - Cummins Swap?
1985 Mercedes 300SD - 210K
1992 Ford Festiva - 92K
2001 Ninja 250 - 8K