Not working: Charge optimization - limit to 80%

[mrpackerguy]

This feature in the Battery>Battery Health>charge optimization>limit to 80% setting doesn't work. My 8 pro continues to charge to 100%. A reddit poster gave a fix to leave the charger on all night and in many, not all instances, it does seem to reset it to the 80% charge limit, but within a couple weeks, it's back to charging to 100% despite not changing the setting and when viewing the setting, still seeing it set to 80%.

 

[tube517]

My wife has a pixel 8 pro and has the same issue

 

[bearone2]

s25+: maybe it's a samsung thing, works for me!!

 

[mrpackerguy]

Any 9 pro or 10 pro users having this issue?

 

[phylez]

This feature in the Battery>Battery Health>charge optimization>limit to 80% setting doesn't work. My 8 pro continues to charge to 100%. A reddit poster gave a fix to leave the charger on all night and in many, not all instances, it does seem to reset it to the 80% charge limit, but within a couple weeks, it's back to charging to 100% despite not changing the setting and when viewing the setting, still seeing it set to 80%.

I know that it needs to go to 100% every so often for calibration purposes.

Any 9 pro or 10 pro users having this issue?

Haven't tried on my 9 Pro yet but my Pixel Tablet is having this issue.

 

[mustang7757]

See if this article helps
Keep the phone charging to 100 percent when u see the shield on the battery then disconnect it
Do this wired , if you do it wireless wait until the charger disappears , this is for battery calibration

https://support.google.com/pixelphone/thread/328885525/the-battery-limit-to-80-is-no-longer-working?hl=en

 

[phylez]

See if this article helps
Keep the phone charging to 100 percent when u see the shield on the battery then disconnect it
Do this wired , if you do it wireless wait until the charger disappears , this is for battery calibration

https://support.google.com/pixelphone/thread/328885525/the-battery-limit-to-80-is-no-longer-working?hl=en

Seems accurate. I've left left my Tablet plugged in after it reached 100% and after an hour or so, I noticed that it's discharging and currently at 97%. The charger and cable that it's hooked up to are enough to keep it charging during use so I'm assuming that were I to leave it, it would continue to discharge to 80% but I wont be able to confirm as I have to unplug it shortly.

 

[mustang7757]

Seems accurate. I've left left my Tablet plugged in after it reached 100% and after an hour or so, I noticed that it's discharging and currently at 97%. The charger and cable that it's hooked up to are enough to keep it charging during use so I'm assuming that were I to leave it, it would continue to discharge to 80% but I wont be able to confirm as I have to unplug it shortly.

This sounds right that it would start discharging after it meets the threshold like I mentioned with the shield or lighting icon depending on wired cable or wireless charging, if you could test this out be great I let mine charge to 100 percent but it's not my daily but does get used I'm talking about my Pixel 10 pro XL which I end up charging every 2 to 3 days .
On my Samsungs and iPhone I have them set at 95 percent which have those options.

 

[phylez]

This sounds right that it would start discharging after it meets the threshold like I mentioned with the shield or lighting icon depending on wired cable or wireless charging, if you could test this out be great I let mine charge to 100 percent but it's not my daily but does get used I'm talking about my Pixel 10 pro XL which I end up charging every 2 to 3 days .
On my Samsungs and iPhone I have them set at 95 percent which have those options.

My 9 Pro functions as you'd expect, whether it's charging wired or wirelessly. However my Tablet charges to 100% every time. A shield will appear at 80%, it will continue to charge to 100%, and then slowly discharge. I've tested this now multiple times over the last week while using the device. Yesterday, I left the Tablet charging over night as I thought I might be disconecting from the power source prior to the calibration being finalized. No luck. So this is either a bug in GrapheneOS or an upstream bug on the Tablet.

 

[mustang7757]

My 9 Pro functions as you'd expect, whether it's charging wired or wirelessly. However my Tablet charges to 100% every time. A shield will appear at 80%, it will continue to charge to 100%, and then slowly discharge. I've tested this now multiple times over the last week while using the device. Yesterday, I left the Tablet charging over night as I thought I might be disconecting from the power source prior to the calibration being finalized. No luck. So this is either a bug in GrapheneOS or an upstream bug on the Tablet.

Thanks for your findings, which tablet is this Samsung?

 

[phylez]

Thanks for your findings, which tablet is this Samsung?

Pixel Tablet running GOS. I'm conducting my final test now. I let it charge to 100% and then played a movie at full bright to bring the charge back down. It's still plugged in and showing steady at 80% with shield. I'm going to leave it like this for a few hours in the hopes that, as unlikely as it is, it's doing some sort of calibration.

 

[mustang7757]

Pixel Tablet running GOS. I'm conducting my final test now. I let it charge to 100% and then played a movie at full bright to bring the charge back down. It's still plugged in and showing steady at 80% with shield. I'm going to leave it like this for a few hours in the hopes that, as unlikely as it is, it's doing some sort of calibration.

Ok let me know but I think it's a calibration thing most likely.

 

[phylez]

Ok let me know but I think it's a calibration thing most likely.

I'm happy to report that it seems to be working. Finally. (Note this is for a Pixel Tablet running latest stable GOS at the time of writing.)

After many attempts at getting this to function, these were the steps performed to achieve calibration. (Whether it was solely this final attempt or a combination of this final attemp along with the previous attempts, I'm not certain.)

1. Battery optimization on.
2. Charge. At 80% shield icon will come on but continue charging to 100%.
3. Once at 100%, leave plugged in and perform a high power consumption activity (eg. play a movie on full bright).
4. Device will discharge to 80% with shield icon and remain steady at 80%.
5. Leave device in this state. Unsure if high power consumption activity needed to ensure calibration but in my case, I left media playing (after discharge reached 80%) for over four hours.
Note: No indication from device if/when calibration is complete.
6. Unplug device and use.
7. The next time device is charged, it will adhere to 80% charge optimization.

Observation: The next time I charged the device, it was around 60%. I plugged in the device (which was powered on and in a secondary profile) and did not use it with the intent on returning 30 min later to unplug as I assumed I'd find it charging above 80%. When returned, I found the device at 80% and assumed it just happened to be at 80% by chance and not because it haulted charging. With the power still attached to the device, it dropped to 79% for about two minutes before returning to 80% where it is holding steady.

So I would say that the device required multiple hours of calibration at 80%. In previous attempts, I would leave the device plugged in where it would remain at 100% (with shield) since there was not enough power consumption to bring it back down to 80%. When at 100%, it did not seem to calibrate properly. Whether this is a bug or related to either the Tablet or GOS, I'm not sure. Will continue to monitor charging and report back if anything new is discovered.

 

[mustang7757]

I'm happy to report that it seems to be working. Finally. (Note this is for a Pixel Tablet running latest stable GOS at the time of writing.)

After many attempts at getting this to function, these were the steps performed to achieve calibration. (Whether it was solely this final attempt or a combination of this final attemp along with the previous attempts, I'm not certain.)

1. Battery optimization on.
2. Charge. At 80% shield icon will come on but continue charging to 100%.
3. Once at 100%, leave plugged in and perform a high power consumption activity (eg. play a movie on full bright).
4. Device will discharge to 80% with shield icon and remain steady at 80%.
5. Leave device in this state. Unsure if high power consumption activity needed to ensure calibration but in my case, I left media playing (after discharge reached 80%) for over four hours.
Note: No indication from device if/when calibration is complete.
6. Unplug device and use.
7. The next time device is charged, it will adhere to 80% charge optimization.

Observation: The next time I charged the device, it was around 60%. I plugged in the device (which was powered on and in a secondary profile) and did not use it with the intent on returning 30 min later to unplug as I assumed I'd find it charging above 80%. When returned, I found the device at 80% and assumed it just happened to be at 80% by chance and not because it haulted charging. With the power still attached to the device, it dropped to 79% for about two minutes before returning to 80% where it is holding steady.

So I would say that the device required multiple hours of calibration at 80%. In previous attempts, I would leave the device plugged in where it would remain at 100% (with shield) since there was not enough power consumption to bring it back down to 80%. When at 100%, it did not seem to calibrate properly. Whether this is a bug or related to either the Tablet or GOS, I'm not sure. Will continue to monitor charging and report back if anything new is discovered.

Thanks for the extensive testing.

 

[phylez]

The following charge, after observing that everything seemed to be working as it should, has resulted in the Tablet again charging beyond 80%. I'm out of ideas at this point. I'm just going to chalk it up to being a bug.

 

[mrpackerguy]

It simply does not hold. I get about 2 weeks of it charging to 80% then it starts charging beyond 80% again. The only way I've found to restart the 80% charging is to keep it on the charger overnight. That gives another 2 weeks of 80% charging before it starts charging past 80%. Rinse and repeat. Accubattery app does continue to notify at 80% though.