I know very little about this from a personal standpoint, other than SEEING the same gizmo inside the back covers of all the 3 Paperwhites that I've so far had the opportunity (I may say the PLEASURE) of peering into. That said..... On youtube there's a trardown-with-commentary clip at https://www.youtube.com/watch?v=phO4QkHW... which mentions the same thing. The blogger there (EEVblog) has a distinct british accent, but I THINK that what HE says is, that it's some type of "RF ID tracking device." (RF ID I take to mean Radio Frequency Identification) See the clip yourself and especially check from 5 mins 20 seconds to 5 mins 42 secs approx. It's very informative for the most part, though most of the extra space that he mentions at 7:28-7:50, with a suggestion that it be utilized by installing a bigger battery, is actually occupied by a transmitting module - probably the 3G receiver- in the units that I've seen. I hope this helps.
I fully appreciate the need for the "FOR ENTERTAINMENT ONLY" disclaimer, as a general possibly legally advisable if not mandatory principle. But I fail to appreciate the entertainment value of reading of someone's AVOIDABLE misfortune when trying to follow a teardown posted here, and only in hindsight realizing that a "small step" that has been left out (such as checking to see that he or she removes a micro-SD card first) results in permanent and perhaps irreversible damage to the item needing repair.
In closing, I must say that I remain CONVINCED that it will be negligent of the site to withold Divinar's comment from being posted in context in the teardown above. And that's all I'm saying.
I copied your comment (ABOVE) and am about to try and paste it into the Teardown Instructions as you suggested. I don't know if you are registered on Ifixit or not, but I think your comment and warning is significant enough that I, like you yourself indicated, don't want to let another do-it-yourselfer or techie fall into the trap you discovered. I hope you will continue to offer helpful comments on here: I'm myself trying to repair TWO Glowlights with faulty glows. Best regards. Larsjohn.
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RE JAKE's remark above.
I fully appreciate the need for the "FOR ENTERTAINMENT ONLY" disclaimer, as a general possibly legally advisable if not mandatory principle. But I fail to appreciate the entertainment value of reading of someone's AVOIDABLE misfortune when trying to follow a teardown posted here, and only in hindsight realizing that a "small step" that has been left out (such as checking to see that he or she removes a micro-SD card first) results in permanent and perhaps irreversible damage to the item needing repair.
In closing, I must say that I remain CONVINCED that it will be negligent of the site to withold Divinar's comment from being posted in context in the teardown above. And that's all I'm saying.
I copied your comment (ABOVE) and am about to try and paste it into the Teardown Instructions as you suggested. I don't know if you are registered on Ifixit or not, but I think your comment and warning is significant enough that I, like you yourself indicated, don't want to let another do-it-yourselfer or techie fall into the trap you discovered. I hope you will continue to offer helpful comments on here: I'm myself trying to repair TWO Glowlights with faulty glows. Best regards. Larsjohn.