In a small city in southern India where I currently live ambient temps. rarely cross mid to late twenties,early thirties at the most in peak summer. And yet reading in my PW3 in the early morning under bright sunlight but not too hot, caused the battery temp. to shoot up from 25°C to 48°C in just half an hour at which I moved it to shade. The body of the Kindle was only a little warm. I removed the case but it made little to no difference.
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