Does the picture of the hand warmer say Zippo on it? If so I didn't know they were into electronics.
Also I am wondering about the heat and the batteries. I know that my cell phone turns off when it gets too hot.
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I didn't know either. And yes, that's my concern too. Although I think phones turn off to prevent damage to their circuitry rather than the battery, it still can't be good for it. I wonder how long these will last.
If the reviews don't say much you might have to trial it for longevity. I think you are right about the circuitry in phones being the bigger issue.