The battery just failed in my Corvette after 3.5 years. So you did well. Cold weather is very hard on them. I had just been up in the mountains where it was rather cold. And then with no warning after eating lunch I come out and nothing - no crank. Luckily I was in the parking lot of my neighborhood auto parts store, so I was back up and running in about 30 min!! Only warning it gave me was a bit hard cranking, but it was subtle. Now that I have a fresh batt the cranking goes much quicker and I realize that the batt had been getting weak. But no other warnings. BTDT countless times - batteries just fail w/o much warning....

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2003 4.6is - SOLD
2003 M5 Imola
2008 Mini Cooper S
2011 Mazda CX9