High idle battery drain due to no deep doze

MolitroMolitro Level 1
edited July 2021 in ZenFone 8

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.



  • MolitroMolitro Level 1

    Well I've just gone ahead and installed Naptime to just force doze (and it does, nothing seems to prevent it hard on the system, so that's good).

    I'll see how it goes for the next couple of days.

  • Install better battery stats to see what's causing the wakeups

  • MolitroMolitro Level 1

    I already explained I use GSam battery monitor for that, and there are no significant wakelocks at all (over the years I've tuned down my idle drain significantly). It has to be a ZenUI thing.

    In any case I think I'll just rely on Naptime to force doze faster than stock, seems like a good solution if it doens't cause problems.

  • MolitroMolitro Level 1
    edited June 2021

    Well, just to keep track of this, on the first night with deep doze the drain got down to 0.5% per hour.

    For a 4000 mah, it's honestly just too much. Let's take into account that's as low as my s10e got, as I said before, with an old 3000 mah battery (and the bloated OneUI, while we're at it, not that it should affect deep doze much).

    Also, in any case, even though I have the CPU and GPU set at minimum performance in the battery settings (cause I don't need the power), and 90hz on the displaym, with screen on, while only reading, battery drops quite fast.

    All of this is to say that, although I'm really quite liking the rest of the phone, and particularly ZenUI, the battery performance is quite bad for supposedly 4000 mah (4000 that are lasting shorter than phones I've seen with 3000. Hell, my old Pixel 3a did better)

  • Same experience here. Enabling ultra durable during night doesn't influence battery drain at all. Last night I managed to get a slightly better idle drain by enabling flight mode.

  • Everything is standard on my Zenfone8.

    Last night (first one) it lost 3% in 6 hours approx.

  • MolitroMolitro Level 1
    edited June 2021

    Originally I thought it was just the idle performance, but really it's just the baseline that's high always. Tonight it drained 0.8% per hour (and I unistalled Naptime to see if it gets back to 0.5%). But during yesterday my phone use was 3 hours of screen time with light use (reading and some browsing) and 3 hours of music over bluetooth earphones and 45 minuts of google podcast.

    That was over about 13 hours. I got home at 20%. That's just too much of a drain for such a light use. Yes, it was a relatively extensive time, but just listening to music seems to drain about as much as having the screen on. If I actually did something heavy I'd be down to what, 3, 4 hours screen time?

    Definitely an issue.

  • shazadzshazadz Level 1

    I lost 3% over 9 hours last night while the phone was on my bedside table,this was the first night,i think the phone is deep sleeping properly?i have restricted quite alot of apps from running in background

  • You are providing us a lot of anecdotal description but can you help provide at least a screenshot on your battery life as the above user did , for example from a "fullish cycle" where you feel the battery was below expectation.

    Also please help describe what other auxiliary functions you may have, or havent, enabled - such as AOD / two SIMs / etc?

    This helps us debug more

    Thank you!

  • MolitroMolitro Level 1

    Thanks for the reply. I was waiting a bit more to try and let the phone stabilize some more, but yeah I'll provide some screenshots.

    I'm using no AOD, 1 SIM, and 5G is turned off (I'm most of the time on moderate to good 4G reception). I use the "pick up to wake the screen" feature (which doens't seem to cause any drain) and finger scanner.

    From what I've been able to tell, today being another example, I think that playing music over bluetooth may be a particularly big power hog, as high as upwards of 7% per hour. It stands to reason this particular use of mine is a very specific cause for my low-sih battery performance. I'll check what's the usage with wired earphones.

    Shot of the system is in spanish, but I think it's pretty self explanatory.

  • shazadzshazadz Level 1

    About after few hours,i have aod off,use face unlock as well as fingerprint

  • If you would be able to - try to restart your device before going to sleep (and not do anything with it), and try to check the idle drain (wihtout having used the device after a restart) over night?

    This may help us narrow down if it is system generic (as in "always") or usage pattern related. I'm suspecting it is usage pattern in some ways, which we need to narrow down more.

    Thank you!

  • MolitroMolitro Level 1

    Well, apparently we can forget bluetooth playback causing a high drain. I didn't need the phone this afternoon so I did an easy test: play the same 2 hour 30m album on wired headphones, then on my 5.0 bluetooth TWS.

    Wired used 3.5% per hour, while bluetooth cause 3.8%, not significantly more.

    I guess the jumps to 7-8% per hour I have in the mornings is simply due to the ocassional screen on time.

    I will restart the phone to check fresh idle drain. In any case, I suspect it'll settle on about 0.5% per hour (mind you I don't turn anything off overnight, wifi stays connected), and while that's high for 4000mah, I wouldn't be surprised if it's just the SD888.

  • MolitroMolitro Level 1

    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.

  • Chris1Chris1 Level 2
    edited June 2021

    Frankly, 0,5% to 0,6% is quite good.

    That's what i have with my Samsung note 9 (4000mAh), and my A42 5G (5000mAh) is at 0,5% too.

    PS : my (recent) Zenfone 8 is at 0,4%.

  • New ota with fingerprint,power consumption and system stability improvements

  • 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.

  • There's a lot of standby drain (% wise) perhaps because your phone has been a lot on standby - seeing as how it lasted "2 days" from 100%?

This discussion has been closed.