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> Random Turn-off when battery is less than 50%
post Jul 9 2019, 10:10 AM
Post #16

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I experienced these kind of shut-downs on my Gemini as well, both on Android 7 as on 8. I do think, that the battery is getting worn out.

It is getting stranger and stranger. Today the Gemini was at 33%. The screen suddenly went orange (power safe mode) and I saw the battery percentage drop to 0%, followed by an immediate shut-down. This was, therefore, not a sudden black-out, it went 'controlled', be it, that the battery dropped from 33% to 0 in two seconds.

I then restarted the Gemini and it came back on 25%. Euh, ok...
After which the power steeply dropped and within three minutes it was again on 5%, after which I put it on the charger. Now, some 25 minutes later, it is happily at 34% and charging.

I would not be too happy with a battery failing after only one year of service.
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post Jul 20 2019, 04:11 AM
Post #17

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I recently started getting this issue too. I'll be using Termux just below 50% battery life and all of a sudden, the battery saver mode will enable (that orange/red theme) and the Gemini will turn off.
This never used to happen with Android 7, only 8. I have noticed the battery life becoming much shorter than what it used to be, so I do hope this is a firmware issue. If not, then I also wouldn't mind purchasing a new battery.
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post Jul 20 2019, 04:27 AM
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I can chime in too: stock Nougat often screen-blanks when I start calling through Skype. It doesn't shut down the machine, the call still goes through (mostly), but a Skype call clearly makes a power demand the Gem can't meet.

This happens regardless of battery level.

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post Jul 20 2019, 10:37 AM
Post #19

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I experienced the random shutdown issue with Oreo - I contacted Planet and they advised re-flashing back to 7 until they figured out what was causing the issue. Seems to be related to the battery calibration as far as I can tell but meditek haven't been able to pinpoint it yet. Back to 7 it is for me....
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post Jul 21 2019, 01:53 AM
Post #20

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Hmmm — my policy of sticking to Android 7 for the time being seems to have paid off! (Unfortunately...)

Now, if only there was some way of preventing Firmware Update notifications twice a day...
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post Jul 22 2019, 06:06 AM
Post #21

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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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post Aug 2 2019, 06:37 AM
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My Gemini also turned off a couple of times (in a row) when the battery level was below 40%. I drained the battery to 5% (running Linux as Android obviously cannot be used for that), then turned the device off, charged to 100%, and started Android. The problem seems to have disappeared.
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