There's plenty of people reporting a higher than expected battery drain on the Zenfone 8, and while we just have to assume the cost of using an 888 snapdragon, there seems to be an issue with the system itself, causing a high idle battery drain.
The phone just never gets into deep doze, no matter how much times it spends turned off. This causes maybe twice the battery drain what it should use while doing nothing.
I'm confident in this being an issue with ZenUI itself, since no amount of wakelocks from apps would cause a literal 0 seconds of deep doze, plus I see no wakelocks or strange behaviour from any apps in either the system battery information or GSam Battery Monitor (an app that's always worked well for me in this regard).
I'm uploading to snapshots from GSam, one from the Zenfone that I just took after leaving the phone alone for 2 and a half hours, and one from my old s10e for comparison. As you can see, the Zenfone just doens't ever enter deep doze, leading, as of this moment, to a 0.7% per hour battery drain while doing nothing, a drain that's easily twice as high as it should be with a 4000 mah battery (for reference the s10e drains about 0.4-0.5% per hour with an older 3000 mah battery)
If we could get a way of fixing this, it'd go a long way to stretch the battery use of the phone.
The phone just never gets into deep doze, no matter how much times it spends turned off. This causes maybe twice the battery drain what it should use while doing nothing.
I'm confident in this being an issue with ZenUI itself, since no amount of wakelocks from apps would cause a literal 0 seconds of deep doze, plus I see no wakelocks or strange behaviour from any apps in either the system battery information or GSam Battery Monitor (an app that's always worked well for me in this regard).
I'm uploading to snapshots from GSam, one from the Zenfone that I just took after leaving the phone alone for 2 and a half hours, and one from my old s10e for comparison. As you can see, the Zenfone just doens't ever enter deep doze, leading, as of this moment, to a 0.7% per hour battery drain while doing nothing, a drain that's easily twice as high as it should be with a 4000 mah battery (for reference the s10e drains about 0.4-0.5% per hour with an older 3000 mah battery)
If we could get a way of fixing this, it'd go a long way to stretch the battery use of the phone.
So I took a few snapshots this morning after leaving the phone from a fresh restart (only went into GSam to set that moment as the start reference and left the phone alone).
It turns out it does get into deep doze by itself, which is good news, but it doens't make a difference. It did 0.6% per hour over the 8:50 hours. It's definitely high for a 4000 mah battery (about twice as much as I expected when buying the phone, taking into account how clean ZenUI is, and what the Pixel 5 or Xperia phones can do with 4000 mah).
There are no apps running amok (just the usual few short maintenance wakelocks), it's just, I suppose, the combination of how Asus does Android plus the SD888.
It turns out it does get into deep doze by itself, which is good news, but it doens't make a difference. It did 0.6% per hour over the 8:50 hours. It's definitely high for a 4000 mah battery (about twice as much as I expected when buying the phone, taking into account how clean ZenUI is, and what the Pixel 5 or Xperia phones can do with 4000 mah).
There are no apps running amok (just the usual few short maintenance wakelocks), it's just, I suppose, the combination of how Asus does Android plus the SD888.
FYI here's a screenshot from when I drained to 1% (I don't do that often). As you can see there's a lot of stand by drain (18% + 15.4% mobile network standby). Very light use, no AOD or 2nd SIM, wifi off during night, 60Hz mode in evening/night, ... I'm at around 1%/hour idle drain.
