With the extreme cold we are currently experiencing here in Denver, CO. I just experienced an incredible drop from fully charged to three bars--in one day. Most of my reading was done outside, in the cold, while smoking. In addition to todays low temps, we've had a few days in the sub 40's since I've purchased my Reader (28th Dec), and had recharged it last night at two bars (only because I was updating books and figured I'd just let it charge until the light went out).
The times I noticed sudden changes in the battery meter seemed to be during the cold as well. Several times I went from three bars during the (cold) day, back to four at night when reading in (warm) bed.
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