Quote:
Originally Posted by dnastase
My H2O died after I left it in a car in the Sun in Florida (summer day) ... 
So it looks like it's a bit sensitive to heat somehow.
I'm saying this bc that's the first electronics that dies on me that way. (I had cell phone and battery powerpack plus other smaller electronics in the car that day. All fine except the H2O ...
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It's not recommended for any of those devices. Even if they survived the day, you may well have permanently shortened their battery life. You certainly will if you do this repeatedly. Some batteries may also explode if overheated.
E-ink substrates are a much thinner glass than cellphones or tablets, so are obviously more prone to breakage from impact, twisting or temperature extremes.