No no. I wrongly related it here. The Pie builds for OP6 are not good for standby, and people say that the 9.0 6 update from the 6T fixed some issues on that phone
i'm on pie from day one with this kernel:
- 0.5%/h idle drain
- 6-5-7.5h SOT on full brightness depending on use case
all this with a quite non-saving setup, 12 email accounts syncing at all times, 5 social media apps running at all times, all themed
setup for good performance withing given parameters, dozens of LED functions, ambient display DOZE 100% disabled etc. etc.
what you were able to read about kernels and battery drain also applies to OS/ROMs as long as there are no known battery hogs.
and the fact that battery consumption is 80-90% user setup /user space is still fully valid.
most people simply don't know how to keep battery usage in check without facing underperformance.
one key is certainly radios, it's the most neglect topic when it comes to battery usage and nobody could ever explain to me why LTE should be needed to make calls and/or to websites are watch a video that runs at a give speed at a given resolution. not only is LTE a lot fast than needed for most use cases, but it's also a lot less stable in cell signal and switching cells more frequently, this beside it's anyway much higher footprint on
the battery.
in short, try to use 2G while screen off and not streaming anything and 3G for common tasks and reduce LTE for tasks where it makes sense and you'll be surprised.
that was only one example, i strongly recommend a wise use of tasker to use the resources of your device according to needs and not according what's possible or what's available, you'll be sruprised at least i do not need sounds at night and syncing + accurate location while sleeping, that alone + most efficient radio can save you 0.5% per hour at night or in idle mode, depending on needs.
story could go on for almost ever, perhaps it would make sense to read through the older batter management threads that got kind of forgotten after doze implementation. for me, doze does not serve because it delays to many tasks i need to be instant and does reduce some of the footprint which i can easily live with, hence i do all the stuff manually like in the old times.
first thing is to purchase a sophisticated battery measurement tool, physical and software and measure useage of a device in detail, especially by app but precisely with time stamp and compare with logs. that will enlighten many to see how many useless tasks are performend and how many are unnecessarily killed, together with the fact that many wakelocks when killed cause more drain due to the ever repeating attempts of apps to get what they want/need done and or starting from scratch rather than keeping certain information in RAM to avoid frequent repetitions.
most of what mentioned cannot only be automated but backed up via TiBu and/or in app backup tools, hence have to be setup once and for all and can be used cross device, not all but many and the rest with small alterations.