1. fullgrownnut's Avatar
    I've had my HTC U11 Smartphone running Android 8.0 for a little over a year now, and one of the things that I've enjoyed most about it was its incredible battery performance. It has a rapid charging system via a USB Type-C connector, and after a full charge and normal use, I ALWAYS get at least two days use out of my battery, and that is with letting it drop to 18% to 15% before I stick it back on charge again. I also always keep my phone on Energy Saver mode.

    Well, just up until about four days ago, I've noticed an unusual drop in battery life, and my battery performance has literally dropped in half, and this also very noticeable even on standby when my phone is not in use. When I go to sleep, even with the phone on Energy Saver, it drains very quickly, and probably loses about 10% or even a little more by the time I wake up again. Before, if I lost 3 to 4% during sleep, that was a lot.

    I've done many troubleshooting steps myself, and of course the first obvious one was to see any apps draining at an unusual rate in the battery statistics section of settings. I've even disabled apps which I've recently installed to see if that was the issue. However, when you observe the battery statistics, at the top of the list is Mobile Network Standby followed by the Android System. Here is a screenshot that I just took of that:

    HTC-U11 SUDDEN Drop in Battery Performance-screenshot_20180816-105105.jpg

    I've also shut my phone off totally for several minutes and turned it back on again a few times since I've been having this issue to see that maybe something would clear itself out/reset any glitches. With these Android phones over the years, I've learned to do that when things start acting up all of a sudden, and it usually helps clear the issue, but with this it does not. I'm starting to think that maybe the battery has just hit its optimum lifespan, but normally you notice a gradual decline once that starts happening, not so suddenly like this.

    Any input/help would be greatly appreciated.
    08-16-2018 10:15 AM
  2. B. Diddy's Avatar
    Does it also happen in Safe Mode? https://forums.androidcentral.com/e?...token=BBRaLdSr
    08-16-2018 03:00 PM
  3. fullgrownnut's Avatar
    Yes, it does.
    08-16-2018 09:27 PM
  4. B. Diddy's Avatar
    Hmm. And this didn't correspond with a recent system update, right?
    08-16-2018 09:37 PM
  5. fullgrownnut's Avatar
    Yes, no recent updates to Android.
    08-16-2018 09:40 PM
  6. B. Diddy's Avatar
    An issue with the battery is becoming more likely. Have you already tried wiping the cache partition? https://support.t-mobile.com/docs/DOC-36638. If that doesn't help, then next step may be a factory reset.
    08-18-2018 11:02 AM
  7. fullgrownnut's Avatar
    An issue with the battery is becoming more likely. Have you already tried wiping the cache partition? https://support.t-mobile.com/docs/DOC-36638. If that doesn't help, then next step may be a factory reset.
    Thanks. By doing this, are there any disadvantageous such as loss of data or information, etc?
    08-18-2018 11:24 AM
  8. B. Diddy's Avatar
    Wiping the cache partition won't affect your personal data -- it's only temporary system data.
    08-18-2018 11:50 AM
  9. fullgrownnut's Avatar
    Wiping the cache partition won't affect your personal data -- it's only temporary system data.
    Ok, I just completed doing it (I even watched a youtube tutorial to make sure I did it right). So I will monitor battery performance now and let you know. Thanks for the help.
    08-18-2018 12:04 PM
  10. fullgrownnut's Avatar
    Wiping the cache partition won't affect your personal data -- it's only temporary system data.
    I was meaning to ask, how exactly does wiping the cache partition fix an issue like fast draining battery? I mean, technically, how is related?

    Nevermind, I found a tutorial explaining, in relation to an old HTC One, but it's still the same process (he explains how and why it can improve battery performance):

    08-18-2018 12:08 PM
  11. B. Diddy's Avatar
    I can't give you any super-technical explanations, but wiping the cache partition has always been a good general troubleshooting step. It's possible that old temporary system data can cause performance issues, so clearing it out has been known to correct lots of different issues.
    08-18-2018 01:24 PM
  12. fullgrownnut's Avatar
    I can't give you any super-technical explanations, but wiping the cache partition has always been a good general troubleshooting step. It's possible that old temporary system data can cause performance issues, so clearing it out has been known to correct lots of different issues.
    Ok, yeah, that's basically what he said in the video, with a couple of more specifics. Well, so far, since I did the wipe, it seems as though my battery is draining normal. I completed it at about 1:00 pm EDT, and my battery was at 85% at that point. It's now currently just about 2:35 pm, and it's been at 84%. It's been just sitting on standby, and just a few notifications have come in. So, so far, so good.

    Before I did the partition wipe, in an hour and a half's time, it most definitely would have been down near 80% or probably even a little lower, so I think this most likely did the trick, but i'm still going to continue to monitor it. I feel good about this at this point, and I really appreciate the advice. I'll keep you posted by giving you an update later tonight.
    B. Diddy likes this.
    08-18-2018 01:35 PM

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