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Old 01-06-2013, 09:35 AM   #16
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Thanks for all the replies.

I'm not completely sure but I don't think epub chapters get loaded into cache so that should also help. Testing now.
I had an epub that I couldn't read at all because the chapter was too long 'on the road' - scroll version by Jack Kerouac. If it could have loaded part of it into the cache I reckon it would have. Had to fix it by opening it in Sigil and adding lots of chapter breaks.
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Old 01-06-2013, 09:49 AM   #17
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I had an epub that I couldn't read at all because the chapter was too long 'on the road' - scroll version by Jack Kerouac. If it could have loaded part of it into the cache I reckon it would have. Had to fix it by opening it in Sigil and adding lots of chapter breaks.
Hm. Interesting. So far though, the epub has been sitting open in sleep mode for just over an hour and the battery still says 100%. So it seems to be behaving more properly now... but I won't be able to say until it's had a longer sit...
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Old 01-06-2013, 12:47 PM   #18
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I was also wondering if you could change the battery in the glo for something a bit loner lasting.
P.S I'm new to this forum btw
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Old 01-06-2013, 12:50 PM   #19
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[QUOTE=Polly7;2369889]I was also wondering if you could change the battery in the glo for something a bit loner lasting.
P.S I'm new to this forum btw[I have not had much luck with lithium type batteries either, nowhere near as reliable or long-lasting as NiMH in my experience. If the Glo battery is replacable, I wonder if there is enough room to replace it with something bigger? I wouldn't mind the extra weight if I could get more reading time from it.]
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Old 01-06-2013, 06:39 PM   #20
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[QUOTE=Polly7;2369893]
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Originally Posted by Polly7 View Post
I was also wondering if you could change the battery in the glo for something a bit loner lasting.
P.S I'm new to this forum btw[I have not had much luck with lithium type batteries either, nowhere near as reliable or long-lasting as NiMH in my experience. If the Glo battery is replacable, I wonder if there is enough room to replace it with something bigger? I wouldn't mind the extra weight if I could get more reading time from it.]
We just discussed this a little further up. For a Kobo Touch (and Glo too we are assured) that is working normally, you will not desire a battery that lasts longer. They already last quite a long time. The claimed time, by Kobo?, of a month or 9000 pages is realistic.

Last edited by jusmee; 01-06-2013 at 07:06 PM.
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Old 01-06-2013, 06:57 PM   #21
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Hm. Interesting. So far though, the epub has been sitting open in sleep mode for just over an hour and the battery still says 100%. So it seems to be behaving more properly now... but I won't be able to say until it's had a longer sit...
I would be interested to know if you come to some definite conclusion - ie problems with the files can impact battery life. If this is so then it could be the answer for a few problems.
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Old 01-06-2013, 07:05 PM   #22
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I would be interested to know if you come to some definite conclusion - ie problems with the files can impact battery life. If this is so then it could be the answer for a few problems.
I would like to know how a datafile, i.e. an epub or whatever, especially because of it's size, can effect battery consumption, when in sleep mode. Any memory/cache that exists to support sleep mode is kept powered on, but the size of the memory shouldn't change. How can you power up have a memory chip? Even when powered up, the static state of memory should have little/no effect of power usage. Likewise, a corrupt file may refuse to load, or load looking a little strange, but I cannot see how this effects battery life.
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Old 01-06-2013, 07:19 PM   #23
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I would like to know how a datafile, i.e. an epub or whatever, especially because of it's size, can effect battery consumption, when in sleep mode. Any memory/cache that exists to support sleep mode is kept powered on, but the size of the memory shouldn't change. How can you power up have a memory chip? Even when powered up, the static state of memory should have little/no effect of power usage. Likewise, a corrupt file may refuse to load, or load looking a little strange, but I cannot see how this effects battery life.
That's right - I agree. But loading a larger part of a file into the cache might use more power than loading a lesser part of a file into the cache. Still, you wouldn't expect it to be much -- but who knows?

It does sound like Mrs_Often just has a defective battery so it would be interesting to know if it is now operating properly.
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Old 01-06-2013, 11:09 PM   #24
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my suspicion ... and why i asked the questions about the file ... is that the size of the file does affect battery drain. i have an 8MB epub I sideloaded, and I noticed incredibly fast drain on my battery. I've had a couple other kepubs that have been missing some of the chapter anchors and so they load large chunks -- 150 pages or so -- and they seem to drain the battery a lot faster than normal sideloaded epubs.

so, in my experience the size of the file, and how much of it gets loaded at a time, seem to affect drain, which I think is what Mrs. Often is also noticing on her device.

personally, I always power down rather than put in sleep mode, unless I know I'm returning very shortly (like after fixing a cuppa). and I always return to the home screen. i don't know that either of these really change the consumption, but if there were a way to minimise battery consumption when not reading, then turning it off, or else putting it to sleep at the home screen (rather than with a book loaded) should minimise the drain.

i've also just had a week where the battery meter kept bouncing between 90 and 100 ... and it sorted itself. so hopefully this was a one-off flakiness that's been sorted so she doesn't have to replace the battery.

in the Netherlands, do you have battery stores that will rebuild internal batteries? I've seen them occasionally ... stores like this: www.mdsbattery.co.uk/ i've had such a place rebuild a laptopn battery before for half the price of a new battery, and it worked fine.
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Old 01-07-2013, 01:35 AM   #25
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I was also wondering if you could change the battery in the glo for something a bit loner lasting.
P.S I'm new to this forum btw
I opened up my Glo and it does look like the battery could be replaced, but it sits in a cut-out section of the circuit board so I don't think it would be possible to fit a larger battery.

Anyway I think I have found the cause of my Glo's lack of stamina, not related to the problems in the OP so I started a new thread: http://www.mobileread.com/forums/sho...d.php?t=201925
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Old 01-07-2013, 01:45 AM   #26
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my suspicion ... and why i asked the questions about the file ... is that the size of the file does affect battery drain. i have an 8MB epub I sideloaded, and I noticed incredibly fast drain on my battery. I've had a couple other kepubs that have been missing some of the chapter anchors and so they load large chunks -- 150 pages or so -- and they seem to drain the battery a lot faster than normal sideloaded epubs.

so, in my experience the size of the file, and how much of it gets loaded at a time, seem to affect drain, which I think is what Mrs. Often is also noticing on her device.
Thanks for passing along this information. I too find it interesting and will take it into consideration when next worrying about my battery. It seems to be working well at the moment -- 3 hours reading a day for 14 days is good enough for me.
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Old 01-07-2013, 02:28 AM   #27
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my suspicion ... and why i asked the questions about the file ... is that the size of the file does affect battery drain. i have an 8MB epub I sideloaded, and I noticed incredibly fast drain on my battery. I've had a couple other kepubs that have been missing some of the chapter anchors and so they load large chunks -- 150 pages or so -- and they seem to drain the battery a lot faster than normal sideloaded epubs.

so, in my experience the size of the file, and how much of it gets loaded at a time, seem to affect drain, which I think is what Mrs. Often is also noticing on her device.
I can think of no mechanism by which this can happen. I suspect something else caused the problem.
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Old 01-07-2013, 03:45 AM   #28
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I can think of no mechanism by which this can happen. I suspect something else caused the problem.
I too think that it was probably something else that caused the problem. However, one mechanism could be a race condition [ http://en.wikipedia.org/wiki/Race_condition ] set up by the way a particular user uses the device at a certain time. A.S.Tanenbaum of MINIX fame claims that this is a very common condition.

I think that the os is based upon LINUX which is riddled with bugs and suffers from innumerable race condition problems. I understand that other major users like Amazon and perhaps Google very successfully use LINUX but they would have had it greatly modified and spent perhaps millions to remove the bugs that they are likely to encounter.

Kobo can't do that. I reckon that Kobo is now at the same sort of place where Apple was [in the mid 90's] when they realised that they could now longer successfully develop their os and started to look around for a complete replacement for it -- neXt-step I think.

Kobo has shown through their inability to control negative bug impacts upon users that they are not able to successfully develop their os from whatever the base is -- LINUX.

We, the users, deserve a re-write.
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Old 01-07-2013, 04:10 AM   #29
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I too think that it was probably something else that caused the problem. However, one mechanism could be a race condition [ http://en.wikipedia.org/wiki/Race_condition ] set up by the way a particular user uses the device at a certain time. A.S.Tanenbaum of MINIX fame claims that this is a very common condition.

I think that the os is based upon LINUX which is riddled with bugs and suffers from innumerable race condition problems. I understand that other major users like Amazon and perhaps Google very successfully use LINUX but they would have had it greatly modified and spent perhaps millions to remove the bugs that they are likely to encounter.

Kobo can't do that. I reckon that Kobo is now at the same sort of place where Apple was [in the mid 90's] when they realised that they could now longer successfully develop their os and started to look around for a complete replacement for it -- neXt-step I think.

Kobo has shown through their inability to control negative bug impacts upon users that they are not able to successfully develop their os from whatever the base is -- LINUX.

We, the users, deserve a re-write.

You'll find linux has less bugs than a lot of commercial software, simply because it is open and anyone can find and fix a bug, not just a small group of paid developers that have agendas put upon them. The reason linux is used for so many back end server systems is that it IS so stable and reliable. Problems with the Kobo reader have nothing to do with linux from what I've seen - it's all what Kobo have done.

Race conditions cannot happen in sleep mode, or when powered off - which is, reportedly, a state in which these devices deplete their batteries.

A rewrite is the last thing you want from Kobo. Writing an OS from scratch is beyond them. Even rewriting their reader code seems to be beyond doing without introducing more bugs than they fix.
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Old 01-07-2013, 05:00 AM   #30
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Quote:
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I would be interested to know if you come to some definite conclusion - ie problems with the files can impact battery life. If this is so then it could be the answer for a few problems.
Quote:
Originally Posted by dakini View Post
my suspicion ... and why i asked the questions about the file ... is that the size of the file does affect battery drain. i have an 8MB epub I sideloaded, and I noticed incredibly fast drain on my battery. I've had a couple other kepubs that have been missing some of the chapter anchors and so they load large chunks -- 150 pages or so -- and they seem to drain the battery a lot faster than normal sideloaded epubs.

so, in my experience the size of the file, and how much of it gets loaded at a time, seem to affect drain, which I think is what Mrs. Often is also noticing on her device.
[...]
Okay, so! It was most definitely the kepub file that was causing the problem. I threw it off and loaded its epub equivalent and the battery stayed at 100% for most of yesterday, until I changed some of the epub's CSS and reloaded it twice causing processing and restarts (so battery usage) when I was finished the battery was at 95%. The battery has stayed at 95% for over 15 hours now, with the epub in question in memory (so I didn't go back to the home screen) and in sleep mode with the light on (well, off, but memory knew it had to switch it on when device was awoken). The 15+ hours includes one hour of reading with the light on (light is always on its very minimum).

This sounds more like what the battery usage should be like! So I'm happy.

Some notes: the epub is only 574KB. However, it is missing a lot of chapter marks. The first 7 chapters are contained in one file and are thus seen as one chapter, so in the kepub version, those are all loaded into cache. That's 255 pages (if I recall correctly) at the ready at any one time. So I would say not surprising that that drains the battery. Unless there's more wrong with the kepub file, but I doubt it. If you'd like to test/see for yourself: the book is David Baldacci's "Absolute power". I got it for about Ä0.39, but unfortunately the Christmas sale for it has ended.

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personally, I always power down rather than put in sleep mode, unless I know I'm returning very shortly (like after fixing a cuppa). and I always return to the home screen. i don't know that either of these really change the consumption, but if there were a way to minimise battery consumption when not reading, then turning it off, or else putting it to sleep at the home screen (rather than with a book loaded) should minimise the drain.
Seems like all the extra hassle isn't actually needed! Well, not for epubs anyway (unless they're HUGE, but I don't know exactly what of an epub is put in cache or not). But your careful battery saving manner would help a lot for kepubs I think.

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I can think of no mechanism by which this can happen. I suspect something else caused the problem.
Well, it was strange to me at first too, but a while back this was explained to me on this forum somewhere when we were discussing what the difference was between battery use in sleep mode vs. in off mode. I can't find the thread right now but I'll add it if I find it later on.

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in the Netherlands, do you have battery stores that will rebuild internal batteries? I've seen them occasionally ... stores like this: www.mdsbattery.co.uk/ i've had such a place rebuild a laptopn battery before for half the price of a new battery, and it worked fine.
Thanks for the tip! I didn't know things like that existed. I'll look around for such a store next time I have a real battery malfunction.
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