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Old 05-04-2020, 09:26 AM   #1
matt0
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battery drains when e-reader is in sleep mode
HI,

I have searched the forum but I did not find any thread on the topic for this specific model.

I have a Kobo AURA E2 and since 3/4 months I have a problem with his battery. Everything started with a firmware update. Before the update the battery was usually lasting around 4 weeks. After the update I get it discharged in 5-6 days.

I keep wi-fi off and the light always on at 1%.
I have waited for a new upgrade (I was sure it was a bug) but it did not solve the problem and I have also tried with a factory reset.

Any suggestion?

Thanks!
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Old 05-04-2020, 10:13 AM   #2
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What f/w are you on?
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Old 05-04-2020, 10:45 AM   #3
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What f/w are you on?
I'm on the 4.20 14622
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Old 05-04-2020, 11:47 AM   #4
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Just to check, do you use a Sleep Cover?

I had a similar issue with my Clara, and it seemed that the cover was loose, probably switching on and off the reader multiple times running the battery down.
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Old 05-04-2020, 02:36 PM   #5
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No, I do not have any cover.
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Old 05-04-2020, 06:18 PM   #6
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Does it get stored around strong (ish) magnets? Or smart covers for other devices?
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Old 05-05-2020, 01:22 AM   #7
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Nope! No magnets, nuclear plants or similar in the surroundings!
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Old 05-05-2020, 09:27 AM   #8
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A "bad" book can cause battery-drain and other oddities. Did you add or recently open a new book? Try removing books. The drain might be unrelated to the FW upgrade.
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Old 05-05-2020, 10:42 AM   #9
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A "bad" book can cause battery-drain and other oddities. Did you add or recently open a new book? Try removing books. The drain might be unrelated to the FW upgrade.
That happened to my once with one of my Sony readers. The reader drained overnight. Once I finished reading the book I had most recently acquired and removed it from the ereader, battery usage went back to normal.
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Old 05-05-2020, 03:36 PM   #10
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Thanks for all the answers.
I usually keep the e-reader clean but to be sure I have removed almost all the books. I have kept only the two that I'm reading at the moment and that I bought after the problem started. I'll seevery soon if that solved the issue.
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Old 05-05-2020, 03:42 PM   #11
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No, I do not have any cover.
Maybe that's the problem.
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Old 05-05-2020, 04:16 PM   #12
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Why not just turn sleep mode off - problem solved. I have never used sleep mode on any of my Kobo's.
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Old 05-05-2020, 05:00 PM   #13
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There's no such thing as "turning sleep mode off".

You either let it sleep, or you shut it down.

What you *can* disable is the smart cover feature, which is essentially a wireless power button that will only ever trigger a sleep or wakeup.
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Old 05-05-2020, 05:51 PM   #14
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Originally Posted by NiLuJe View Post
There's no such thing as "turning sleep mode off".

You either let it sleep, or you shut it down.

What you *can* disable is the smart cover feature, which is essentially a wireless power button that will only ever trigger a sleep or wakeup.
If removing the books doesn't fix it, definitely try this next. If that fixes it, it may either be a defective cover or where you're storing it.

I've noticed my Clara (with smart cover and automatic sleep/wake) will drain mysteriously if just leaned up against a large steel bookend for a couple of days. If I place it further down the line between some books it's fine.
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Old 05-05-2020, 11:27 PM   #15
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If removing the books doesn't fix it, definitely try this next. If that fixes it, it may either be a defective cover or where you're storing it.
A bad book on the device should only affect things at three points. The first is when it is first added to the device and the import is done. This opens the book and extracts information to add to the database. The second is when a cover image is first needed. Again, the book is opened and the cover is generated or extracted. The third is when the book is opened for reading.

The last is generally when the problems are seen. The errors in the book probably are triggering problems that leave background tasks using resources. If this is the issue, then restarting the device will fix things until the problem book is opened again.

The other two times, could also cause this, but seem to be less likely to trigger the problems. But, if they do, again, restarting the device should stop the task using power.
Quote:
I've noticed my Clara (with smart cover and automatic sleep/wake) will drain mysteriously if just leaned up against a large steel bookend for a couple of days. If I place it further down the line between some books it's fine.
That probably means the steel is interacting with the magnet in the cover and the sensor. There have been a few reports like this. The one I get caught on is that carry a laptop, iPad and ereader in my bag going to and from work. The magnets in the iPad cover can prevent the ereader from going to sleep. Or continuously wake and sleep as they move a little bit.
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