I received a follow-up report back from the Amazon PW2 user who's device had been on 5.7.2.1 with the "battery-drain" issue, and who had already contacted Amazon support, was not given any alternative other than the offer of a $15.00 discount on a new replacement, and posted his issue in product reviews for the PW2....
He successfully downloaded 5.7.3 from Amazon's site, and completed the OS upgrade...
He reported back 3 days ago that his PW2 was now performing normally but wanted to wait a couple more days to observe the battery meter with 5.7.3
He just reported back again about an hour ago that his PW2 is continuing to behave "normally" and expressed his sincere thanks for saving the device...
I asked him for further clarification about the "DP75SDI" model number, and he stated it was printed on the back of the device itself (guess he has a very good magnifier and a good flashlight...lol). I didn't press him further to dig into settings to see the first 4 of the serial
He was the only one of about 5 users reporting the battery drain issue that responded back.... not sure if the others solved the problem or tossed out their "dead" Paperwhites...
At this point, unless the devs here have discovered a hidden gotcha with 5.7.3, would advise anyone running 5.7.2.1 on PW2, go ahead with the upgrade to 5.7.3 (PW2)
No direct experience yet with PW3's exhibiting this behavior, so that will be open for anyone else to post about it
Hope this helps
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