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> Random Turn-off when battery is less than 50%
Kisuke-CZE
post Sep 21 2018, 04:36 AM
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Hi guys,

I am using mi Gemini as my daily driver. I use Android, because it seems to be only full featured OS so far.
Recently I noticed strange behavior.

My Gemini is sometimes randomly turning off. It happens when battery is about 38%. But it happened about 30% too. But never when batter was full.
If device is in idle mode, it is OK. But when I am doing something - browsing in Firefox for example, or in the middle of call with someone - Gemini screen just turns black. Then I must turn it on by long pressing "On" button. It boots up Android. And if I do same thing (run Firefox) right after boot, it mostly crashes to black screen again. If I wait for few minutes after boot it is in most cases OK (for some time), sometimes I must charge battery and then it is OK.

Anyone with same issues? Or any thougts? From mine point of view it seems to be some problem with battery or with Gemini itself. Because it happens only on energy-intensive activities (which I suppose having phone call or running big app like Firefox is).
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Konehaltia
post Jul 22 2019, 06:06 AM
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I've had the same random shut-off problem with my Gemini for over a year now.

At first, it seemed to occur only rarely. I didn't take any specific notes, but it seemed to generally happen in conditions with bad radio connectivity, like on a moving train or on a mountain, and only when the device was in active use. It never shut off in my pocket. Every time, the screen just went blank with no warning. Yet, when I started it back up, it would have a high battery level and continue to run normally for hours more.

More recently, the shutoffs became more frequent. Sometimes, after I started it up after the first shutoff, it would happen again as soon as it finished booting and got to the PIN code screen. Sometimes this even repeated 3 or 4 times.

The shutoffs have never happened while the Gemini is plugged into the official USB charger, so it definitely seems like a power issue.

I'm not sure if the reason it's been getting more frequent is the Android 8 upgrade or not. It could simply be the battery wearing out over time, since recently I've also been seeing some normal signs of the battery getting old, such as it showing 10% left and then suddenly jumping to 0% and showing a "powering off" message. To be clear, the low-battery shutoffs are a different issue that I've also had with other phones when the battery gets old. The blank-screen shutoffs are different - the battery level doesn't matter at all, and the shutoff is instant, with no message.

At any case, I got to borrow my friend's almost-unused Gemini a couple of weeks ago. I upgraded it to Android 8, and I've been using it normally ever since. It hasn't shut off once. Either it doesn't have the same bug, or the battery on it is still fresh. At any case, the problem is clearly not caused by Android 8 alone, though it may of course happen more often if Android 8 uses the battery in a different way.

However, the new Gemini does have the disappearing SD card issue mentioned earlier in this thread. I didn't use an SD card with the old Gemini, so I hadn't seen the issue before, and don't know if it would have happened with Android 7.
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Radovan Garabík
post Jul 23 2019, 04:54 AM
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QUOTE(Konehaltia @ Jul 22 2019, 03:06 PM) *
I've had the same random shut-off problem with my Gemini for over a year now.


It happened to me only about twice (in half a year or so). I was not paying much attention to it, considering it a random fluke, but I remember once the Gemini was quite maxed out (connected via HSDPA and running as an access point, while simultaneously I started a browser on it). Perhaps there is no reasonable margin of error in the maximum battery current and random increase in power consumption switches on the protective circuit and cuts the power.
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Radovan Garabík
post Sep 9 2019, 10:19 AM
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QUOTE(Radovan Garabík @ Jul 23 2019, 01:54 PM) *
QUOTE(Konehaltia @ Jul 22 2019, 03:06 PM) *
I've had the same random shut-off problem with my Gemini for over a year now.


It happened to me only about twice (in half a year or so). I was not paying much attention to it, considering it a random fluke, but I remember once the Gemini was quite maxed out (connected via HSDPA and running as an access point, while simultaneously I started a browser on it). Perhaps there is no reasonable margin of error in the maximum battery current and random increase in power consumption switches on the protective circuit and cuts the power.


Replying to myself...

It happened 3 times today. The first time was after an hour or so of Gemini working as a SIM->wifi hotspot, some minutes I switched the hotspot off and started to use the Gemini "the usual way". The battery was at about 40%.
I looked at the battery utilization graph, and noticed that after the spontaneous turning off, the 1st derivative was maybe about twice as big (in absolute value) as usual, for about 10 minutes.

The next time was after an hour, when the battery reached 14%. The rate of battery discharge was normal this time.

The third time was again when the Gemini was working as a wifi hotspot, but this time it has been charging (using the official Planet charger), and it might have been already fully charged (or very close).

After the first time, I started to suspect the battery experiences sudden drop in the charge and is perhaps not able to sustain the power/current requirement. But after the third time... I do not know.
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Posts in this topic
Kisuke-CZE   Random Turn-off when battery is less than 50%   Sep 21 2018, 04:36 AM
Murple2   QUOTE(Kisuke-CZE @ Sep 21 2018, 01:3...   Sep 21 2018, 10:18 AM
Murple2   I continue to have this issue and have a few more ...   Sep 29 2018, 01:08 AM
Kisuke-CZE   Hi, since I started this thread, I would like to ...   Oct 26 2018, 02:51 AM
Dixit   QUOTE(Kisuke-CZE @ Oct 26 2018, 12:5...   Oct 26 2018, 03:27 AM
gymbo   QUOTE(Kisuke-CZE @ Oct 26 2018, 12:5...   Oct 26 2018, 12:16 PM
Kisuke-CZE   Well, I am not sure what the problem is. Not a pro...   Oct 27 2018, 12:56 AM
gidds   QUOTE(Kisuke-CZE @ Oct 27 2018, 09:5...   Oct 27 2018, 01:58 AM
Kisuke-CZE   Hi, just posting new update. Since it belongs in ...   Jul 3 2019, 02:48 AM
Penorek   Hi, "periodically disappearing SD card from ...   Jul 7 2019, 12:55 AM
novaldex   I'm experiencing the same problem, but only wh...   Jul 8 2019, 01:26 AM
gidds   Has anyone suffered this on Android 7, or is it de...   Jul 8 2019, 08:16 AM
gymbo   QUOTE(gidds @ Jul 8 2019, 06:16 PM) Has a...   Jul 8 2019, 08:43 AM
Penorek   In my way is it only a problem since Oreo   Jul 8 2019, 11:33 AM
SNi   Mine has recently started to "turn off" ...   Jul 8 2019, 03:34 PM
Ifanafi   Ditto the same issue exactly. My Gemini is now US...   Sep 3 2019, 11:59 AM
Ifanafi   Update From: Customer Care (Planet Computers) Sep...   Sep 4 2019, 10:42 AM
smapmap   QUOTE(Ifanafi @ Sep 4 2019, 07:42 PM) Upd...   Sep 4 2019, 12:08 PM
mithrandir   Hoping for higher capacity 3rd party replacement b...   Sep 5 2019, 12:31 PM
smapmap   QUOTE(mithrandir @ Sep 5 2019, 09:31 PM) ...   Sep 6 2019, 04:45 AM
jakfish   I think my battery is shot. Anybody know where we ...   Sep 7 2019, 07:02 AM
Dixit   I experienced these kind of shut-downs on my Gemin...   Jul 9 2019, 10:10 AM
RSS   I recently started getting this issue too. I'l...   Jul 20 2019, 04:11 AM
jakfish   I can chime in too: stock Nougat often screen-blan...   Jul 20 2019, 04:27 AM
smapmap   I experienced the random shutdown issue with Oreo ...   Jul 20 2019, 10:37 AM
gidds   Hmmm — my policy of sticking to Android 7 for th...   Jul 21 2019, 01:53 AM
Konehaltia   I've had the same random shut-off problem with...   Jul 22 2019, 06:06 AM
Radovan Garabík   QUOTE(Konehaltia @ Jul 22 2019, 03:06 PM)...   Jul 23 2019, 04:54 AM
loop   My Gemini also turned off a couple of times (in a ...   Aug 2 2019, 06:37 AM
Radovan Garabík   QUOTE(Radovan Garabík @ Jul 23 2019, 01...   Sep 9 2019, 10:19 AM
Ifanafi   Yep, my Gemini SUDDENLY (and invariably) shuts its...   Sep 3 2019, 11:49 AM
zsalab2   I had the same issue, reverted to android 7.1. N...   Sep 15 2019, 08:05 AM
gidds   This raises issues about the Cosmo... While it...   Sep 15 2019, 10:26 AM
gymbo   QUOTE(gidds @ Sep 15 2019, 08:26 PM) This...   Sep 15 2019, 12:59 PM
David H   I have had the same issue with the device turning ...   Nov 19 2019, 03:43 AM


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