Cold weather tips for extending Lithium-Ion cells?
I'm writing some articles about maxing out the lifespan of lithium-ion polymer batteries, and I was wondering if those of you in colder climates have found tips for keeping your batteries warm to extend their life. The chemistry doesn't do well under 0 degrees Celsius (32˚ F).
What has worked for you? What about mobile devices like cell phones that need to be exposed in order to use them?