Quote:
Originally Posted by davidfor
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.
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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David, I stand with you. You are absolutely correct in what you say, I only wanted to say that I think it likely that the theoretical maximum of page flips the KA1 can support with this battery is about 2.000. For what a page flips, as unit is worth, it is just an indication.
You have to detract a lot of things to that
- kepub / eput interpreting
- lighting control
- turning on / off must consume something, as little as it is; pushing the button must activate an interrupt of some sort that must be handled with some CPU cycles within the operating system.
- higher resolution may have some small impact
- time spent off (however little)
- additional activities (settings, browsing in collections, requested system data such as time and place in book etc.)
- etc. (you get the idea)
And all of this is further worsened by the individual style of reading (going back and forth, looking up words etc)
I would hazard that the practical limit of
useful page flips is about a quarter, i.e. I do not expect to be able to read more that about 500 pages before needing to recharge.
Which is slightly annoying; I wonder if it can last a transatlantic voyage, it should...
If I remember correctly a few years ago the readers were able to get about 2-3 times as much of pages. I was able to read about 3 books with one charge. I wonder if writing a reader SW on the bare HW instead of having to negotiate through an OS would be less wasteful of energy, but I understand that the effort of writing it from scratch is too big (too many things missing).
All said and done, though, I think KA1 is gorgeous, I would not go back to the 6" format, I am spoiled now.
I find also the keyboard much better and really useful, but that should be due to the SW, not the HW.