Quote:
Originally Posted by badbob001
It's also possible that some sort of process is running in the background that is keeping the device more active than needed. For example, when you open a file, it loads a separate viewer for that file type: pdf viewer for pdfs, image viewer for images, epub viewer for epubs, and etc. It has been shown that viewing a particular file type for the first time takes longer than subsequent times, which seems to imply that for subsequent use, the viewer is still loaded and ready. This may explain why results are so varied.
I don't know how the device handles task management. That is, when does it shutdown a viewer, if ever? At standby? When switching to another viewer? When a certain resource threshold limit is reached? One way to rule out a runaway or crashed process ruining battery life is to reboot the device before testing and don't do anything with the device. For comparison measurements, it may also help to limit usage to particular features to see if one of them is faulty (example scenario: only view one particular file type and don't turn on 3G").
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Maybe, but we'd need more testing to figure it out. One of the theories about the DR1000 power drain bug is that the PDF viewer is getting hung during shutdown, and prevents the device from fully powering off. This is a completely different PDF viewer than what is in the current DR800 firmware though. It's possible that the problem mgmueller had was similar with his 4 day battery, and there was a viewer/process that didn't let the device go into standby correctly for some reason.
What I can say is that during my initial testing where I got two weeks, I pretty much had a PDF document open the entire time. I didn't do anything special to close the document or reboot before I would put it into standby. So it would appear that, in my case, the PDF viewer acted correctly. Perhaps ePub behaves differently though? It's at least worth testing.