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Old 11-19-2014, 09:35 AM   #1
seadad9903
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Battery life issue

Hi all, anyone have an issue with battery life? I have a PW2, fw 5.4.3.2, with jb/KUAL/screensaver hack/collections manager. Recently the battery started draining very quickly, i. e. charged during the day on Saturday and Monday afternoon was down to 23%. Had not read anything, it had been on the screensaver the whole time and the backlight was at 0.
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Old 11-19-2014, 09:48 AM   #2
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Quote:
Originally Posted by seadad9903 View Post
Hi all, anyone have an issue with battery life? I have a PW2, fw 5.4.3.2, with jb/KUAL/screensaver hack/collections manager. Recently the battery started draining very quickly, i. e. charged during the day on Saturday and Monday afternoon was down to 23%. Had not read anything, it had been on the screensaver the whole time and the backlight was at 0.
The useful lifetime of a Li-Ion battery is very hard to judge.

Depending on use patterns (depth of discharge, frequency of re-charge, price of tea in China) their storage capacity can degrade, and perhaps faster than expected.

So what you are seeing may be "normal" -
What is your nominal temperature where the device is kept?
How old is the device?
How often do you recharge it?
How low do you let the capacity fall before you recharge it?
What are you recharging it with (slow: USB port, fast: wall charger)?
How often and long do you use it over what period of time between recharges?

Indexer related questions (*)-
How many books are on it?
Have you added, removed, or reorganized them recently?

(*) the kindle is normally very close to off (most of it is powered down, not running) -
Even while reading a book (it wakes to turn the page, or when the beer gets warm).
But the indexer and anything else that keeps it "awake" more than usual will show in the time between when a recharge is required.
The Kindle has about 4 hours of "runtime" on a good, full capacity, fully charged battery and you are seeing 2 days.

Last edited by knc1; 11-19-2014 at 09:57 AM.
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Old 11-19-2014, 10:15 AM   #3
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Quote:
Originally Posted by knc1 View Post
What is your nominal temperature where the device is kept?
How old is the device?
How often do you recharge it?
How low do you let the capacity fall before you recharge it?
What are you recharging it with (slow: USB port, fast: wall charger)?
How often and long do you use it over what period of time between recharges?
Mid 70ºF
a year(-ish) old. Maybe 18 months
I let it drop until I see the low battery warning
Wall
Depends. Sometimes I won't pick it up for a week or two. Sometimes I'm on it every day.

Quote:
Originally Posted by knc1 View Post
Indexer related questions (*)-
How many books are on it?
Have you added, removed, or reorganized them recently?
It has 400 books (give or take) on it, and I added 3 on Friday.


Quote:
Originally Posted by knc1 View Post
(*) the kindle is normally very close to off (most of it is powered down, not running) -
Even while reading a book (it wakes to turn the page, or when the beer gets warm).
But the indexer and anything else that keeps it "awake" more than usual will show in the time between when a recharge is required.
The Kindle has about 4 hours of "runtime" on a good, full capacity, fully charged battery and you are seeing 2 days.
Sitting unused on the screensaver would count as not "awake", would it not? If so, as I understand what your last sentence says I am seeing 75% battery drain on 0 hours of runtime.
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Old 11-19-2014, 11:02 AM   #4
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@seadad9903-
As knc1 noted, indexing can chew through battery life. Check to see if your PW is still indexing...this is usually caused by a problem book that you have added. If it is, delete the problem book file and reload it.
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Old 11-19-2014, 11:18 AM   #5
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Quote:
Originally Posted by seadad9903 View Post
- - - -
Sitting unused on the screensaver would count as not "awake", would it not? If so, as I understand what your last sentence says I am seeing 75% battery drain on 0 hours of runtime.
It would not count as "not awake" -
The display of the screensaver does not indicate internal system activity.

You would have to check the kernel log at about that time to see if it went to sleep or suspend.

An example of what to look for (will vary with kernel version, build, etc)
Code:
000101:011049 [   16.481363] PM: Syncing filesystems ... done.
000101:011049 [   16.486442] PM: Preparing system for mem sleep
000101:011532 [   16.489772] Freezing user space processes ... (elapsed 0.01 seconds) done.
000101:011532 [   16.518434] Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
000101:011532 [   16.538270] PM: Entering mem sleep
000101:011532 [   16.538278] Suspending console(s) (use no_console_suspend to debug)
000101:011532 [   16.545172] mwan: D elmo_suspend:elmo_suspend::disable irqs
000101:011532 [   16.557079] udc suspend begins
000101:011532 [   16.557318] USB Gadget suspend ends
000101:011532 [   16.596278] KERNEL: I pmic:fg suspend battinfo:current=60mA, volt=3910mV, capav=070%, mAh=673mAh:
000101:011532 [   16.616570] add wake up source irq 105
000101:011532 [   16.617845] add wake up source irq 51
000101:011532 [   16.617908] PM: suspend of devices complete after 72.742 msecs
000101:011532 [   16.618305] PM: late suspend of devices complete after 0.379 msecs

000101:011532 [   16.619075] PM: early resume of devices complete after 0.186 msecs
000101:011532 [   16.619252] remove wake up source irq 51
000101:011532 [   16.731672] remove wake up source irq 105
000101:011532 [   16.736723] KERNEL: I pmic:onkey::wario button online event
000101:011532 [   16.750941] KERNEL: I pmic:fg resume battinfo:current=0mA, volt=3923mV, capav=070%, mAh=659mAh:
000101:011532 [   16.994822] USB Gadget resume begins
000101:011532 [   16.994830] fsl_udc_resume, Wait for wakeup thread finishes
000101:011532 [   17.016593] dr_controller_run: udc enter low power mode 
000101:011532 [   17.016610] USB Gadget resume ends
000101:011532 [   17.036995] mwan: D elmo_resume:elmo_resume::enable irqs
000101:011532 [   17.037034] PM: resume of devices complete after 417.835 msecs
000101:011532 [   17.128303] PM: Finishing wakeup.
The above is kernel v-3.0 on a KT2 (fw 5.6.1, diags), yours will not be identical but should be recognizable.

Last edited by knc1; 11-19-2014 at 11:38 AM.
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Old 11-19-2014, 11:34 AM   #6
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How can I check the kernel log?

Checked for indexing books, there were quite a few. I'm going to delete them and add a few at a time

Last edited by seadad9903; 11-19-2014 at 11:39 AM.
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Old 11-19-2014, 11:47 AM   #7
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Do you have USBnetworking package installed?
or
Do you have kTerm package installed?

- - - - -

Some firmwares have a "magic search key" to copy the logs into the user storage -
I don't have a PW2, running 5.4.3.2 -
Anyone else know what it is (or might be) on that device?
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Old 11-19-2014, 11:49 AM   #8
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no to both
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Old 11-19-2014, 11:55 AM   #9
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Quote:
Originally Posted by seadad9903 View Post
How can I check the kernel log?

Checked for indexing books, there were quite a few. I'm going to delete them and add a few at a time
There's no need to take the matter any further, that being the case. Indexing will drain the battery like crazy. Personally I always leave my Kindle connected to the wall charger while it's indexing.
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Old 11-19-2014, 08:56 PM   #10
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Quote:
Originally Posted by knc1 View Post
Some firmwares have a "magic search key" to copy the logs into the user storage -
I don't have a PW2, running 5.4.3.2 -
Anyone else know what it is (or might be) on that device?
Isn't that
Code:
;dm
http://wiki.mobileread.com/wiki/Kind..._Bar_Shortcuts


And the Paperwhite section just below. I don't think Amazon has been changing anything there.
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Old 11-20-2014, 11:04 AM   #11
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Oh, right, my bad.
Right along with the
Code:
;jb
(Jailbreak) command.
I seem to forget the obvious more and more often these days.
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