Effect of freezing on Lithium Ion Batteries

[NeoDevin]

A quick google search reveals conflicting opinions on whether or not this will have a negative impact on battery life. I carry my laptop outdoors with me every day on my walk from the train to the hospital, do I need to worry about the cold ruining my battery?

[Greg Bernhardt]

anyone?

[seerongo]

These links should be reassuring.

This one shows that the capacity loss of a charged Li-I battery is actually best at 0 C. Of course, this is just barely freezing, but there is no caveat about temps lower than this.
www.batteryuniversity.com/parttwo-34.htm

Another link (a pdf file) shows that they operate as low as -50 to -80 C. NASA requires -80C. I couldn't seem to copy the whole URL, but it can be found at:
www.covalentassociates.com/

I don't know where you live, but if you still have to worry about it, dress warmly.