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Old 07-11-2017, 07:01 PM   #16
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Something strange.

My Kobo Aura One works well these days. The battery wasn't discharged in the sleep mode like what happened on the Saturday. I keep a watch on the battery when reading, the percentage of the battery disminished gradually and normally. But something very strange happened twice, yesterday and today. The battery was 68% or 67% and suddenly (I did nothing special, I checked the battery after reading several minutes) went to 52%. Then it was normal again. Today the battery was on 42% and suddenly went to 31%. It seems to be normal again.

Anybody experienced that?
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Old 07-11-2017, 07:55 PM   #17
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When any of my devices start fast discharging, I restart the device.
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Old 07-11-2017, 08:33 PM   #18
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Quote:
Originally Posted by Spinnenmonat View Post
My Kobo Aura One works well these days. The battery wasn't discharged in the sleep mode like what happened on the Saturday. I keep a watch on the battery when reading, the percentage of the battery disminished gradually and normally. But something very strange happened twice, yesterday and today. The battery was 68% or 67% and suddenly (I did nothing special, I checked the battery after reading several minutes) went to 52%. Then it was normal again. Today the battery was on 42% and suddenly went to 31%. It seems to be normal again.

Anybody experienced that?
Yes, there are reports of that happening. The Aura ONE seems to be most prone to it. It isn't one of the things I've ever really worried about as I've never assumed the battery rundown would be perfectly linear. The question for me has always been what the total runtime is. The claims that Kobo make work out to about 15 hours of reading. If you are getting somewhere in that range, then there isn't an issue. But, remember, that is reading. Most of the other activities, such as browsing through your library looking for the next book to read, use a lot more CPU and IO and hence more battery.
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Old 07-11-2017, 09:49 PM   #19
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Quote:
Originally Posted by Spinnenmonat View Post
Something strange.

My Kobo Aura One works well these days. The battery wasn't discharged in the sleep mode like what happened on the Saturday. I keep a watch on the battery when reading, the percentage of the battery disminished gradually and normally. But something very strange happened twice, yesterday and today. The battery was 68% or 67% and suddenly (I did nothing special, I checked the battery after reading several minutes) went to 52%. Then it was normal again. Today the battery was on 42% and suddenly went to 31%. It seems to be normal again.

Anybody experienced that?
Yes, I've had a KA1 since last October and just recently started to think a charge maybe wasn't lasting as long. Checked over 3 discharges from 100% to 10% (when the reader insists you recharge) and those sudden drops happened every time. Twice each cycle it dropped about 12-15% while just reading. I'm suspecting its a battery calibration issue as it happened during a period of reading with no other activity, so a whole cycle is needed for comparison.

Anyway it looks like I get ~11 hours reading from 100% to 10% (90% as this is the actual time between recharging- ~12hrs if it was fully discharged). Sounds low compared to the 15 hours Kobo quotes - however the discharge rate really depends on the screen turns in this time - literally mileage may vary from person to person!

I read quite fast and keep my font size a little larger because of eye problems - so more screen turns; but I also reduce margins and line-height to cut back page turns.

And just realised that so far I haven't collected some essential info to get good figures on the screen turn rate! I'll report again in a few days after the next full discharge cycle.
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Old 07-12-2017, 07:09 AM   #20
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I think when you are seeing a rapid discharge like that, there is a background process that is chewing cpu time. A full shutdown / restart should fix that.

The old firmwares sometimes did that if I started a search in a PDF and aborted it.
The new firmwares sometimes do it without help, not sure why.
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Old 07-12-2017, 07:40 PM   #21
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The sudden drop of battery percentage happened again. I would like to know, whether it is the bug of the actual firmware or an uncurable problem of Kobo itself.
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Old 07-12-2017, 08:02 PM   #22
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Old 07-12-2017, 09:14 PM   #23
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Quote:
Originally Posted by Spinnenmonat View Post
The sudden drop of battery percentage happened again. I would like to know, whether it is the bug of the actual firmware or an uncurable problem of Kobo itself.
Is it happening at the same percentage of battery? If so, it's probably an issue with how the measurement and probably can't be fixed.

Or, if it is happening at a particular usage (after 50 minutes of reading, or after a sync, or after using the browser), then it is probably a firmware issue and might be fixable if the cause can be tracked down.

If it is completely random, it will be harder to work out whether it is a hardware fault, a software fault or just something in the nature of the devices.
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Old 07-16-2017, 02:33 AM   #24
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I finally got brave the other day & let my Aura 6" update... Last nite what I went to sleep I checked the battery. it was on 75%... when I got up the morning is was on 5%!! This is one bug I can do with out
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Old 07-16-2017, 05:16 AM   #25
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I finally got brave the other day & let my Aura 6" update... Last nite what I went to sleep I checked the battery. it was on 75%... when I got up the morning is was on 5%!! This is one bug I can do with out
Did you turn off the light before you let the device go to sleep?
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Old 07-16-2017, 11:56 AM   #26
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Quote:
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I finally got brave the other day & let my Aura 6" update... Last nite what I went to sleep I checked the battery. it was on 75%... when I got up the morning is was on 5%!! This is one bug I can do with out
I don't know about Kobo but when Amazon did their big update on older devices, they specifically said plug it in for the update.
Updates sometimes take a lot of power.
So that may or may not be a bug.

*personal opinion
Anytime I am doing anything I think might be a power hog, I plug the device in to use it.
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Old 07-16-2017, 07:12 PM   #27
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Originally Posted by davidfor View Post
Is it happening at the same percentage of battery? If so, it's probably an issue with how the measurement and probably can't be fixed.

Or, if it is happening at a particular usage (after 50 minutes of reading, or after a sync, or after using the browser), then it is probably a firmware issue and might be fixable if the cause can be tracked down.

If it is completely random, it will be harder to work out whether it is a hardware fault, a software fault or just something in the nature of the devices.
I can confirm now. It happened exactly at the same percentage of battery and the the amount of the reduction is also the same. So is it the bug of this new firmware or the character of this unit of device?
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Old 07-17-2017, 07:39 AM   #28
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So is it the bug of this new firmware or the character of this unit of device?
Firmware bug. It isn't stopping something or turning something off when it is suppose to go to sleep. Older firmwares didn't do this.
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Old 07-17-2017, 09:12 AM   #29
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Firmware bug. It isn't stopping something or turning something off when it is suppose to go to sleep. Older firmwares didn't do this.
That's why I'm suggesting everyone on this firmware turn off the light before stopping reading and putting the Kobo to sleep. That works for me. I don't have the light draining the battery or the light turning back on when awoken.
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Old 07-17-2017, 11:47 PM   #30
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The A1 Dropping rapidly by about 10% at the same 2 or 3 points on the meter has been a characteristic of the device for every firmware release since the first. It's not at all related to the problems with light not turning off or stuck process draining overnight.
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