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On my T62+ clone from Energy Sistem I currently get around 20-30 days of standby with about 30mins of reading a day on 2-4 full bars of backlighting. The wifi is also on constantly, so I'm sure I could get 30 days consistently with it off. Certainly it isn't as impressive as a typical E-Reader, but the additional flexibility and not being tied to one store is a good plus. For me charging it every 2-3 weeks is totally fine.
I rooted my device as there was terrible drain without being able to freeze some system applications (2-4 days max. standby). The main culprit for whatever reason on the Energy Sistem rom for me was Google Drive or Gmail, I never unfroze either to find out which one. The other odd thing was they didn't show up under wakelocks or alarms so I have no idea why they caused such a drain. I also limited my CPU to the minimum. The kindle app was particularly slow, so I would suggest avoiding that as it probably will drain battery as CPU works harder. Another reason for rooting was to hide the status bar in apps other than default one as the expected behaviour in "fullscreen" mode does not occur.
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