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  • Charging optimization (80% charge limit) recalibration with Android 15 QPR2

xxx Thank you for your answer :) Could you be more specific ? What do you mean when you say "kind of" ?

    GrapheneOS The best thing for battery health will be using the battery optimization feature and leaving the device plugged in as much as possible to take advantage of bypass charging instead of repeatedly draining and charging the battery.

    In situations where I detach from charger and come back with e.g. 60-70% left, does it make sense to always plug it back in or better to wait for it go down lower to e.g. 30% before plugging in? To put it another way, does increasing the amount of such smaller in total amount (60->80) charged charging cycles/sessions or to stick to lower amount of charging cycles where more total amount (30->80) is charged? In both scenarios afterwards always leaving the phone on charger.

        whiskeywalrus
        Batteries wear out the least if they have a 30% gap between the lower and upper range, i.e. never have less than 30% remaining charge and never have more than 70% charge.
        It then also takes a little longer to achieve the corresponding number of full charge cycles.

        A good compromise for frequent users or users of devices with very small batteries is charging at 20 to 80 %.
        This wears out the battery more quickly, but the device can be used with fewer restrictions or the owner may not feel so restricted.

        Conclusion: If it is possible for you or if you do not find it strenuous, charge the battery at 30 or 40 % and only charge it to around 70% if you are not using the device locally for hours on end.
        It would be ideal if we could set not only 80% but also 70% as the charging limit in GrapheneOS.
        If I understood the release notes correctly, the GOS developers may realise this later.

            Eagle_Owl Batteries wear out the least if they have a 30% gap between the lower and upper range, i.e. never have less than 30% remaining charge and never have more than 70% charge.

            Is it possible to provide one or more sources supporting this claim?

                Every thing I read and the battery manufacturers I have spoken too about phone batteries, responded with similar results,
                Charge your battery to saturation point, ie 100%, remove from the charger and use it as normal, but don't allow the battery below 20% routinely.
                Every so often allow the battery to discharge fully, then charge it, this allows for recalibration on the battery etc. My 6a (July 2022 build) is coming up to 3 years old, the battery count is 128 and it behaves as new.
                The problem with batteries as is everything else related to phones, is the human operating it. No one takes the time to look after the battery, the phone is used almost continuously, charged re charged and left on charge, no wonder the batteries fade. Removable batteries are the answer, but fewer devices would be sold,

                  geko

                  Build January 2022 here.

                  470 cycles 😂

                  Like new.

                    Eagle_Owl Batteries wear out the least if they have a 30% gap between the lower and upper range, i.e. never have less than 30% remaining charge and never have more than 70% charge.

                    de0u Is it possible to provide one or more sources supporting this claim?

                    Eagle_Owl One of the many sources you can find about this on the Internet comes from Isidor Buchmann, the founder of Cadex, a company that has been researching and producing batteries and chargers in this field for decades:
                    https://batteryuniversity.com/article/bu-802c-how-low-can-a-battery-be-discharged

                    But I don't think that page says "never have more than 70% charge". It says "30% to 80%" for automobiles, and mentions satellites without giving numbers (the link goes to a page about satellites and rovers that says "[depth of discharge] of 40 to 60 percent", which is not a narrow range).

                    There are other issues with that site. It's ad-heavy, for one thing. Also I'm not seeing a lot of coverage of charge rate, discharge rate, charging temperature, or discharge temperature, all of which affect longevity in addition to the charge limit and discharge limit. I can see how mobile-phone users, who can easily "see" the charge limit and depth of discharge, might focus on those two numbers, but focusing on what's easy to measure while overlooking charge/discharge rate and temperature might lead to poor results.

                    Is there something on that site along the lines of "We took 200 Pixel 7a's and split them randomly into two groups, then we did charge/discharge cycles with one group cycling between 20% and 80% while the other group cycled between 30% and 70%, and after four months the 30%-to-70% group had batteries that were 30% healthier on average"? Results like that might justify a request to the GrapheneOS developers to support multiple thresholds. But I'm not seeing evidence like that on that page.

                    Is there something like that elsewhere on that site? Or on some other site? Again, the claim was "never less than 30% and never more than 70%".

                          GrapheneOS

                          I have selected the option to limit my phone charging to 80% from battery settings.

                          Recently my phone started charging to 100%.

                          I am aware of the that this is by design and that the phone must recalibrate the battery and therefore must charge the phone to 100% until calibration is established.

                          I am aware that calibration is established when there is a shield icon displayed with the charging icon.

                          My phone has charged to 100% multiple times. It is remained plugged in for at least two to three hours afterwards. In fact it is probably remained plugged in for much longer as it was charged while I was sleeping. I have never seen the shield icon.

                          Also possibly related, my phone has been discharging extremely fast. From about 80% to zero within an hour.

                          I have not tried to toggling the 80% as there are no instructions to do so even though some users on Reddit have indicated that that has worked.

                          Another user seem suggested that the calibration is not getting triggered. This would make sense but I'm finding nothing to work around it.

                          Thoughts?

                              xgp Turn it off, wait 10 seconds, turn it back on and then plug it in until it shows the shield icon.

                                Aeon Mine works with wireless charging. It was actually a surprise, I thought it would only work with USB-PD.

                                    I enabled the 80% limit and the first charge after actvating it went up beyond 80%. I thought that was for calibration, so I let it charge up to 100% to finish calibration. Since then, three more charges (of three) did not stop at 80% either.
                                    So it seems there is something wrong, doesn't it?

                                      ToolTimeTim7
                                      +1

                                      My family has 3 phones (all 6a), for two of them the limit is working just fine like it did before, one doesn't seem to recognise the limit and is charging to 100%. This has happened multiple times so far, even after the recalibration.

                                      Same phones, same settings. I couldn't find the reason yet.