Battery usage question

mzel · 10-01-2020, 01:14 PM

Is it possible that reading different content in KOReader results in different battery usage?
I am seeing drastic differences when it is a simple text and manual book with lots of photographs and cross-links which I do follow to. It is like 1 week vs 1 day on 1 charge of the battery.
I am on Kobo Forma if that matters

NiLuJe · 10-01-2020, 02:25 PM

Err, yeah, of course?

Alan_S · 10-01-2020, 06:15 PM

That still sounds a bit too much.

Not sure what is going on, but probably it is more of a thing that in complex book you also go a lot back and forth, so processor works a lot.

In my experience, my H2O (first gen) lasted about 14-20 days, and now KA1 lasts about 7-10 days (half that time as it has half that battery). And both have different "battery usage display", i.e. battery indication was pretty different on both devices (H2O tended to be longer in high percentage with much faster drop with lower ones, and KA1 is a bit opposite).

ilovejedd · 10-01-2020, 07:47 PM

e-ink displays use power whenever you turn the page. I remember marathon reading manga and I think I got just 1 day with around 16 hours or so onscreen time with likely ~2-3,000 page turns (full refresh every single page).

NiLuJe · 10-02-2020, 09:29 AM

Oh, I was definitely talking about the computational difference involved in handling the different types of content, the eInk stuff is barely relevant as far as power consumption goes.

mzel · 10-02-2020, 10:18 AM

Well, I understand there is a difference, but I am surprised it can be on the scale of 1 to 10

NiLuJe · 10-02-2020, 10:29 AM

You're basically describing the difference between a laptop sitting in screensaver mode and a laptop running a game.

(I'm barely exaggerating here ^^).

mzel · 10-03-2020, 05:15 PM

Ok, in that case it would make sense.
Thanks a lot!

mzel · 10-06-2020, 11:50 AM

Would it make a difference if the .epub is zipped or not?

Incanus · 10-06-2020, 11:54 AM

Quote:

Originally Posted by mzel

Would it make a difference if the .epub is zipped or not?

I should think so. Open a ZIP -> CPU added time -> Battery use

Kind regards,

mzel · 10-06-2020, 11:55 AM

Right, but does it not create an unzipped temporary copy on the 1st use?

NiLuJe · 10-06-2020, 07:06 PM

An ePub *is* already a ZIP archive in disguise, so, that doesn't make much sense?

theducks · 10-06-2020, 08:08 PM

Quote:

Originally Posted by mzel

Would it make a difference if the .epub is zipped or not?

EPUB IS already a zipped archive, just has a few special rules.
Si Zipping a Zip gains mostly extra work.

mzel · 10-07-2020, 12:37 PM

Ok, I guess we are getting closer. I was mistaken about having that book as a .zip in Kobo. But does that mean that if we have the text part of the book in the cache as .cr3, we still go unzipping to pull every picture?

10-01-2020, 01:14 PM	#1
mzel Connoisseur Posts: 92 Karma: 10 Join Date: Apr 2016 Device: Kobo Forma	Battery usage question Is it possible that reading different content in KOReader results in different battery usage? I am seeing drastic differences when it is a simple text and manual book with lots of photographs and cross-links which I do follow to. It is like 1 week vs 1 day on 1 charge of the battery. I am on Kobo Forma if that matters

10-01-2020, 07:47 PM	#4
ilovejedd hopeless n00b Posts: 5,111 Karma: 19597086 Join Date: Jan 2009 Location: in the middle of nowhere Device: PW4, PW3, Libra H2O, iPad 10.5, iPad 11, iPad 12.9	e-ink displays use power whenever you turn the page. I remember marathon reading manga and I think I got just 1 day with around 16 hours or so onscreen time with likely ~2-3,000 page turns (full refresh every single page). Last edited by ilovejedd; 10-01-2020 at 07:51 PM.

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10-01-2020, 02:25 PM	#2
NiLuJe BLAM! Posts: 13,480 Karma: 26012494 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	Err, yeah, of course?

10-01-2020, 06:15 PM	#3
Alan_S Evangelist Posts: 440 Karma: 1084584 Join Date: Aug 2007 Location: Sisak, Croatia Device: Kobo Aura H2O, Kobo Aura ONE	That still sounds a bit too much. Not sure what is going on, but probably it is more of a thing that in complex book you also go a lot back and forth, so processor works a lot. In my experience, my H2O (first gen) lasted about 14-20 days, and now KA1 lasts about 7-10 days (half that time as it has half that battery). And both have different "battery usage display", i.e. battery indication was pretty different on both devices (H2O tended to be longer in high percentage with much faster drop with lower ones, and KA1 is a bit opposite).

10-02-2020, 09:29 AM	#5
NiLuJe BLAM! Posts: 13,480 Karma: 26012494 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	Oh, I was definitely talking about the computational difference involved in handling the different types of content, the eInk stuff is barely relevant as far as power consumption goes.

10-02-2020, 10:18 AM	#6
mzel Connoisseur Posts: 92 Karma: 10 Join Date: Apr 2016 Device: Kobo Forma	Well, I understand there is a difference, but I am surprised it can be on the scale of 1 to 10

10-02-2020, 10:29 AM	#7
NiLuJe BLAM! Posts: 13,480 Karma: 26012494 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	You're basically describing the difference between a laptop sitting in screensaver mode and a laptop running a game. (I'm barely exaggerating here ^^).

10-03-2020, 05:15 PM	#8
mzel Connoisseur Posts: 92 Karma: 10 Join Date: Apr 2016 Device: Kobo Forma	Ok, in that case it would make sense. Thanks a lot!

10-06-2020, 11:50 AM	#9
mzel Connoisseur Posts: 92 Karma: 10 Join Date: Apr 2016 Device: Kobo Forma	Would it make a difference if the .epub is zipped or not?

10-06-2020, 11:55 AM	#11
mzel Connoisseur Posts: 92 Karma: 10 Join Date: Apr 2016 Device: Kobo Forma	Right, but does it not create an unzipped temporary copy on the 1st use?

10-06-2020, 07:06 PM	#12
NiLuJe BLAM! Posts: 13,480 Karma: 26012494 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	An ePub is already a ZIP archive in disguise, so, that doesn't make much sense?

10-07-2020, 12:37 PM	#14
mzel Connoisseur Posts: 92 Karma: 10 Join Date: Apr 2016 Device: Kobo Forma	Ok, I guess we are getting closer. I was mistaken about having that book as a .zip in Kobo. But does that mean that if we have the text part of the book in the cache as .cr3, we still go unzipping to pull every picture?

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