Thread: Aura One battery experiences???
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Old 09-19-2016, 03:08 AM   #121
davidfor
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Posts: 24,905
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Join Date: Jul 2011
Location: Sydney, Australia
Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos
Quote:
Originally Posted by brudigia View Post
If it helps: just had it for one week. Read one book, recharged it yesterday and I noticed an 11% drain in an hour and discovered that even though the wifi was off, the KA1 was trying to synch and there was no way to stop it, but to start it up again.

After that the synch was not there anymore.
This is the important thing. There is a bug in the 4.0 firmware that means it can start doing a sync but never complete. This uses lots of CPU and hence battery.

And just because the WiFi is off, doesn't mean the sync process isn't started. What is probably happening is that some event happens that triggers a sync (this might not be a full sync, but a "sync current book status" or something else like that). The sync process is started and it gathers data about what it needs to do. Part of that will be checking for an active network. My guess is that there is a bug in this process that means it doesn't terminate and keeps trying. And the only way to stop that, is to restart the device. And that's what is needed until Kobo fix the problem and release firmware with the fix.
Quote:
I topped it up and did some work on the books I had loaded on it (about 1400, 203 pages). There should have been 400 hundred fewer of them, but also the ones which were not downloaded appear, thanks to the disappearance of the option for not showing them.
Anywat, just paging through them, to check for doubles between epubs and kepubs, which means turning slightly more than 200 pages, plus some activities (very few) and the battery went down to 91%.

Thus if 200 pages = 9%, 100% of battery might be good for 2000 pages. I do not believe it will ever be like that, though, because of the consumption of power for the lighting and other issues which have already been mentioned.
Even the, apparently, if well used, with no synch and no wifi, the battery should not be so bad. We shall see at the practical level, I would like to be able to read more than one book (I know it depends on the number of pages), with one charge, we'll see if I can.
I'm not sure if you can compare paging through the library with reading. The library list will probably user more power. It has to read the cover images from the disk, and if they don't exist, render them from the book. If you are just going back and forth through a few pages, it is probably similar, but paging through the whole lot will probably use a lot more power than paging through a book.
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