Clara HD Battery drain when using a magnetic clip cover

OneiroDancer · 06-21-2019, 04:19 AM

Well, the subject says it all.

I had the feeling that the magnetic clip cover was causing a battery drain in my Kobo Clara HD, yesterday I had a quick test and can confirm it:

* two hours in stabdby with the magnetic clip cover: battery down from 100% to 92%
* twelve hours in standby without cover: battery down to 91%

So, at the moment I am using it without cover. I was wondering, has anybody else experimented this? May it be due to a bad cover build, or should I give up the use of a cover?

dpoirier · 06-21-2019, 06:56 AM

Did the standby without cover test also start at 100%? Because 100% to 91% in standby in 12 hours seems much more than I would expect, but 92 to 91 would be plausible.

mbovenka · 06-21-2019, 07:55 AM

Quote:

Originally Posted by OneiroDancer

I had the feeling that the magnetic clip cover was causing a battery drain in my Kobo Clara HD, yesterday I had a quick test and can confirm it:

Interesting. That might actually explain the idea I have that my Forma has started to use more battery of late. I'm using an aftermarket sleepcover since a few weeks... I'll do a test over the weekend.

davidfor · 06-21-2019, 08:08 AM

I rarely have the Clara HD sleep for a long time without the cover closed. There hasn't been an issue with the battery draining. And I just checked it. I last used it about 24 hours ago. At that time, I connected it to the PC to while transferring a book to it. Then I disconnected it and closed the cover. I just opened the cover and it is at 99%. It was probably fully charged when I disconnected it.

I do get an occasional unexpected battery discharge from my devices. But, it almost always happens in my work backpack. I have come to the conclusion that the magnets in the covers of the Aura ONE, Clara HD and iPad can interfere with the other devices and prevent them from sleeping. I think the iPad cover is the culprit as it has more than one magnet and they seem to be stronger. And that it depends on exactly how they all sit together in the bag.

OneiroDancer · 06-21-2019, 09:12 AM

Quote:

Originally Posted by dpoirier

Did the standby without cover test also start at 100%? Because 100% to 91% in standby in 12 hours seems much more than I would expect, but 92 to 91 would be plausible.

No no, they were two consecutive tests: in two hours with the cover it discharged by 8%, in twelve hours without cover it discharged by 1%.

OneiroDancer · 06-21-2019, 09:18 AM

Quote:

Originally Posted by davidfor

I rarely have the Clara HD sleep for a long time without the cover closed. There hasn't been an issue with the battery draining.

Does your cover has a brand? Mine is a nameless one bought on Amazon, maybe with a better one the problem wouldn't show, but I am somewhat reluctant to buy another one without at least some hint that it wouldn't show the problem...

davidfor · 06-21-2019, 09:32 AM

Quote:

Originally Posted by OneiroDancer

Does your cover has a brand? Mine is a nameless one bought on Amazon, maybe with a better one the problem wouldn't show, but I am somewhat reluctant to buy another one without at least some hint that it wouldn't show the problem...

I'm using the official Kobo cover on the Clara HD.

Are you sure the device is actually sleeping? Can you see that the light has gone off? Or briefly see the sleep screen when you open the cover?

issybird · 06-21-2019, 10:24 AM

With my H2O and my Glo HD, shutting the covers tends not to put them to sleep. I have to be careful and slide the front of the cover to the left to turn off the light. And one's an official Kobo cover and the other isn't.

OneiroDancer · 06-21-2019, 10:51 AM

Quote:

Originally Posted by davidfor

I'm using the official Kobo cover on the Clara HD.

I will buy and try it.

Quote:

Originally Posted by davidfor

Are you sure the device is actually sleeping? Can you see that the light has gone off? Or briefly see the sleep screen when you open the cover?

I have seen that sometimes the device does not sleep when I close the cover, in that case I can see the light throught the borders of the cover. This was not the case with the test I made yesterday: the light went off, and when I opened it again I could briefly see the sleep screen, as usual. Also, 8% in two hours is too much even for a non sleeping device, it almost seems as if the clip drains the battery!...

Barbara1955 · 06-21-2019, 11:05 AM

Another thread on this subject:

https://www.mobileread.com/forums/sh...d.php?t=310518

I use this case:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Open/closed on/off I see No Difference in battery. BUT Leave the WiFi On it Dies Quick. I suggest you turn Off the Wifi when not needed. My light is at 50 - 60% I keep the Color lights OFF.

OneiroDancer · 06-22-2019, 03:05 AM

Quote:

Originally Posted by Barbara1955

Another thread on this subject:

https://www.mobileread.com/forums/sh...d.php?t=310518

Mmmh, interesting. In that case it turned out to be a problem with PDF--that is surely not my case, I only read epub. But some comments indicate problems more similar to mine.

Quote:

Open/closed on/off I see No Difference in battery. BUT Leave the WiFi On it Dies Quick. I suggest you turn Off the Wifi when not needed. My light is at 50 - 60% I keep the Color lights OFF.

I know that WiFi can make a differenze, but that's an order of magnitude less than the problem I'm having: my device does have the wifi on, but the battery lasts so many days anyway that I loose the count. On the other hand, due to the cover problem it discharged in just two days...

frostschutz · 06-22-2019, 05:48 AM

even with wifi on, unless you set it to forcibly stay on forever (not possible in the menu I think, but can be done in the config file), it turns off the wifi after a minute anyway. so even with wifi on, technically it's off most of the time.

always-on wifi does eat up the battery rather quickly but unless you mod it, you don't have that

most likely your device is waking up when you don't expect. the magnet sensor should have an half-mode. turn off when cover is closed. require button push to wake up. then the random wakeup problem (every time the cover wiggles a bit) would be gone

Semwize · 06-22-2019, 07:12 PM

That's right, Clara keeps the battery SUBSTANTIALLY smaller than the Glo HD

Without SleepCover, the battery is consumed less. There is a suspicion that programmers have confused again.

06-21-2019, 04:19 AM	#1
OneiroDancer Enthusiast Posts: 45 Karma: 2148536 Join Date: Jul 2015 Device: Onyx Poke 3, Kobo Clara HD	Battery drain when using a magnetic clip cover Well, the subject says it all. I had the feeling that the magnetic clip cover was causing a battery drain in my Kobo Clara HD, yesterday I had a quick test and can confirm it: * two hours in stabdby with the magnetic clip cover: battery down from 100% to 92% * twelve hours in standby without cover: battery down to 91% So, at the moment I am using it without cover. I was wondering, has anybody else experimented this? May it be due to a bad cover build, or should I give up the use of a cover?

06-21-2019, 11:05 AM	#10
Barbara1955 Non-Techy Posts: 4,455 Karma: 15499273 Join Date: Feb 2011 Location: WV---USA Device: Samsung Cell Phone & Amazon Fires & Kobo eReaders	Another thread on this subject: https://www.mobileread.com/forums/sh...d.php?t=310518 I use this case: https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1 Open/closed on/off I see No Difference in battery. BUT Leave the WiFi On it Dies Quick. I suggest you turn Off the Wifi when not needed. My light is at 50 - 60% I keep the Color lights OFF. Last edited by Barbara1955; 06-21-2019 at 11:13 AM.

06-22-2019, 07:12 PM	#13
Semwize Guru Posts: 900 Karma: 270670 Join Date: Jun 2016 Device: Kobo	That's right, Clara keeps the battery SUBSTANTIALLY smaller than the Glo HD Without SleepCover, the battery is consumed less. There is a suspicion that programmers have confused again. Last edited by Semwize; 06-22-2019 at 07:15 PM.

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06-21-2019, 06:56 AM	#2
dpoirier Member Posts: 11 Karma: 10 Join Date: Sep 2013 Device: Kobo Clara HD, Kobo Forma	Did the standby without cover test also start at 100%? Because 100% to 91% in standby in 12 hours seems much more than I would expect, but 92 to 91 would be plausible.

06-21-2019, 08:08 AM	#4
davidfor Grand Sorcerer Posts: 24,905 Karma: 47303824 Join Date: Jul 2011 Location: Sydney, Australia Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos	I rarely have the Clara HD sleep for a long time without the cover closed. There hasn't been an issue with the battery draining. And I just checked it. I last used it about 24 hours ago. At that time, I connected it to the PC to while transferring a book to it. Then I disconnected it and closed the cover. I just opened the cover and it is at 99%. It was probably fully charged when I disconnected it. I do get an occasional unexpected battery discharge from my devices. But, it almost always happens in my work backpack. I have come to the conclusion that the magnets in the covers of the Aura ONE, Clara HD and iPad can interfere with the other devices and prevent them from sleeping. I think the iPad cover is the culprit as it has more than one magnet and they seem to be stronger. And that it depends on exactly how they all sit together in the bag.

06-21-2019, 10:24 AM	#8
issybird o saeclum infacetum Posts: 21,133 Karma: 234223171 Join Date: Oct 2010 Location: New England Device: Mini, H2O, Glo HD, Aura One, PW4, PW5	With my H2O and my Glo HD, shutting the covers tends not to put them to sleep. I have to be careful and slide the front of the cover to the left to turn off the light. And one's an official Kobo cover and the other isn't.

06-22-2019, 05:48 AM	#12
frostschutz Linux User Posts: 2,282 Karma: 6123806 Join Date: Sep 2010 Location: Heidelberg, Germany Device: none	even with wifi on, unless you set it to forcibly stay on forever (not possible in the menu I think, but can be done in the config file), it turns off the wifi after a minute anyway. so even with wifi on, technically it's off most of the time. always-on wifi does eat up the battery rather quickly but unless you mod it, you don't have that most likely your device is waking up when you don't expect. the magnet sensor should have an half-mode. turn off when cover is closed. require button push to wake up. then the random wakeup problem (every time the cover wiggles a bit) would be gone

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