[Firmware 1.4] How many page turns are you getting

[TallMomof2]

I had great battery life before the upgrade but now I use 50% of my battery after a few hours of reading.

[tpw]

Originally Posted by 3d0g

Next 1000...

power-on - no change
1100 - no change
1200 - 2nd level drop
1300 - no change
1400 - no change
1500 - no change
1600 - no change
1700 - no change
1800 - no change
1900 - no change
2000 - no change

Thanks for taking the time to do this. How long are you leaving in between page turns? In real life the average page is probably on screen for 1-2 minutes, and even though the buttons aren't being pressed there's still power draw. A more accurate test would need to factor this in.

Basically I'd just like Kobo to release some specs showing current draw under different circumstances:

Current draw when turning pages
Current draw when static page is displayed
Current draw in sleep
Current draw when powered off

Presumably none of these are zero.

FWIW under real life reading conditions I can usually get through 2 x 400 page books (where there are usually 3 page turns per book page). I think my battery life is longer if I take the SD card out, but that might be wishful thinking.

[3d0g]

Next 1000...

power-on - no change
2100 - no change
2200 - no change
2300 - no change
2400 - no change
2500 - no change
2600 - no change
2700 - no change
2800 - no change
2900 - 3rd level drop
3000 - no change

At 3 days and 3K pages now, I'm down to the last 1/4 of the battery indicator. So unless the battery indicator is terribly non-linear, 8K turns doesn't seem likely...

tpw - I'm turning pages as quickly as possible (somewhere between 1-2 seconds). Yes, this would produce a "best case" count, but I don't think it's possible to accurately account for inter-page idle time. For you it's 1-2 minutes (a slow reader?), for me, when reading normally, I do a page every 5-10 seconds at the medium font setting.

Excellent point on the SD card. I would expect more power draw with the card installed and even more if the book was being read from it. In this test, I *do* have an SD card installed but the book I'm using is a kobobooks purchase. That means it's on internal storage in the sqlite format.

[dixieknits]

Originally Posted by Thrasher

The ePubs that I have read so far I have to click next page about 3 times until the page number changes....

I think it depends on the size of the font picked. If you pick smallest, you will get one page turn per one click.

[DNSB]

Originally Posted by tpw

FWIW under real life reading conditions I can usually get through 2 x 400 page books (where there are usually 3 page turns per book page). I think my battery life is longer if I take the SD card out, but that might be wishful thinking.

My limited testing shows about a definite drop in battery life when I use the SD card. OTOH, given the time to restore the books that were on my original Kobo when it died compared to popping the SD card back in, I'm willing to put up with the drop in battery life (about 10-15% in my opinion).

What I'm more curious about is the effect of charge/discharge cycles on the battery life -- is it better to run the battery right down before charging , will recharging each night even if not really needed cause a shortened battery life.

BTW, one excellent way to drain the battery is to pop a SD card with a few hundred books in and let it start processing them. After the Kobo stalled and I plugged it into the computer, I noticed a file called koboreader.sqlite.journal was in the .kobo folder but the screen never went to the Plugged In screen. After fully charging and unplugging, it took another 30 minutes to finish processing and has been happy since.

Doesn't everybody buy a couple of hundred books in one purchase?

[zoran]

Originally Posted by DNSB

My limited testing shows about a definite drop in battery life when I use the SD card. OTOH, given the time to restore the books that were on my original Kobo when it died compared to popping the SD card back in, I'm willing to put up with the drop in battery life (about 10-15% in my opinion).

I noticed a file called koboreader.sqlite.journal was in the .kobo folder but the screen never went to the Plugged In screen.

Doesn't everybody buy a couple of hundred books in one purchase?

I planned to use SD card for ebook storage, but might change
my mind if true.

Since I'd use one unix system to mount the reader, I could see
the directory tree and put books where-ever it is fine to do. Where
newly added books live on your device? The question is if the
reader could see them and update db.

From content of my post you know I still wait for my reader.

Sqlite uses one file to store data. Operating system may take
any number of additional files to read and write to it. Developers
decide how it should work. I'm now sure why should "journal" file
be shown on the desktop application screen.

Best regards.

[tpw]

Originally Posted by 3d0g

tpw - I'm turning pages as quickly as possible (somewhere between 1-2 seconds). Yes, this would produce a "best case" count, but I don't think it's possible to accurately account for inter-page idle time. For you it's 1-2 minutes (a slow reader?), for me, when reading normally, I do a page every 5-10 seconds at the medium font setting.

Fast reader, but using smallest or small fonts

[Bismar]

My reader conked out just shy of 3000 pages. This was reading done over two days.

Looks like i have to get an exchange with Borders. Stupid folks at the store won't deal directly with me even though i bought it from them. Have to contact them through their helpline number.

[tpw]

Originally Posted by Bismar

My reader conked out just shy of 3000 pages. This was reading done over two days.

Looks like i have to get an exchange with Borders. Stupid folks at the store won't deal directly with me even though i bought it from them. Have to contact them through their helpline number.

3000 page turns is probably pretty good, I'm not sure you'd do much better with an exchange.

I wonder if it takes less cpu to display Kobo books vs standard epubs?

[Bismar]

Originally Posted by tpw

3000 page turns is probably pretty good, I'm not sure you'd do much better with an exchange.

I wonder if it takes less cpu to display Kobo books vs standard epubs?

I beg to differ actually, one of the key selling points to me was the 8000 page turns. I get less then half of that.

If a new unit makes no difference, then its pure blatant false advertising.

[3d0g]

Next 1000...

power-on - no change
3100 - no change
3200 - no change
3300 - no change
3400 - no change
3500 - no change
3600 - no change
3700 - no change
3800 - no change
3900 - no change
4000 - no change

[HamsterRage]

Originally Posted by Bismar

I beg to differ actually, one of the key selling points to me was the 8000 page turns. I get less then half of that.

If a new unit makes no difference, then its pure blatant false advertising.

Really? 8000 page turns is about 20-30 typical novels on the smallest font. That's a hell of a lot of reading, and I'd suspect that for most people would take more than 2 weeks to complete - and 2 weeks was the other half of the advertising on the battery life.

From the "How many books do you read...?" thread in one of the other forums, it looks fair to say that most people are reading under 100 books a year, or at most 4 books every two weeks. That's still going to be well under the 3000 page turns Bismar got.

So I'm struggling to see how a mere 3000 pages would be a make-it-or-break-it issue for anyone, since that would mean having to plug the unit in for a few hours every three weeks or so. Especially when, if you're reading that much, you'll have to plug it in to sideload the books onto it in the first place.

[tpw]

Originally Posted by Bismar

I beg to differ actually, one of the key selling points to me was the 8000 page turns. I get less then half of that.

If a new unit makes no difference, then its pure blatant false advertising.

False advertising? Maybe overly optimistic advertising. I think 8000 turns was either some kind of best case scenario under optimum conditions at Kobo central, or a theoretical number based on current draw and battery capacity. In any case, I think just about no-one is achieving it under real life reading conditions. 3000 turns seems to be a good figure from what I've seen other people getting here. I doubt you'll get a magical 8000 page unit on exchange

[3d0g]

Next 1000...

power-on - no change
4100 - no change
4200 - no change
4300 - no change
4400 - no change
4500 - no change
4600 - no change
4700 - 4th level drop
4800 - no change
4900 - no change
5000 - no change

[zoran]

Originally Posted by 3d0g

Next 1000...

power-on - no change
4100 - no change
4200 - no change
4300 - no change
4400 - no change
4500 - no change
4600 - no change
4700 - 4th level drop
4800 - no change
4900 - no change
5000 - no change

Yep, files on SD card should take more power, since it is
hardware at work. My best bet is that faster cards drain
less. At least I learnt it from music player usage.

As epub books are from various sources, of distinct lengths
and formatting, would be fine to know if shorter parts give
better power consumption. Calibre have an option to change
that size. Maybe it is not a matter of different readers, but
different books people read?