1. Lisa Kelsch's Avatar
    I have an NUU A3, and the original charger broke, so I have been using replacements. That charger (the original) worked until it didn't. I just received a new charger but it still is draining my battery. I rebooted the phone and suddenly it's charging fine, (I also took the battery out and put it back in) and it's down to 4% from 47% before rebooting. It either discharges or charges slowly. This phone is less than a year old. I've been trying to charge it fully for a couple of days now at least. I took out FB messenger bc I figure it's draining my battery.
    01-09-2020 05:38 PM
  2. mustang7757's Avatar
    Hi Welcome!
    To me it sounds like battery needs to be replaced.
    Rukbat likes this.
    01-09-2020 06:13 PM
  3. B. Diddy's Avatar
    Welcome to Android Central! Charge up to 100%, then let it drain to 20-30% with normal usage, without charging in between. Then show us:

    1. The main Settings>Battery screen.
    2. The fullscreen battery graph screen (which may show Awake time and Cell Signal Strength).
    3. The Screen category (to see total Screen On time).
    4. The Cell Standby category, if present (to see Time Without Signal).


    http://forums.androidcentral.com/gen...d-central.html
    You might have to install a 3rd party battery monitor, like GSam Battery Monitor, to get the Cell Signal Strength graph.
    01-09-2020 06:20 PM
  4. Mooncatt's Avatar
    This sort of symptom usually means the power isn't making it to the battery in the first place. I know you replaced the charger, but have you tried a new USB cable? That's usually the first culprit because they break internally with long term use.

    If you wiggle the USB plug in the phone port, does that cause the connection to cut in and out? If so, that can indicate either a bad USB cable or bad phone port.
    01-10-2020 10:10 AM
  5. mustang7757's Avatar
    This sort of symptom usually means the power isn't making it to the battery in the first place. I know you replaced the charger, but have you tried a new USB cable? That's usually the first culprit because they break internally with long term use.

    If you wiggle the USB plug in the phone port, does that cause the connection to cut in and out? If so, that can indicate either a bad USB cable or bad phone port.
    I don't Know battery was at 47 percent and OP took it out and and boot up it was at 3 percent sound like battery to me
    01-10-2020 11:16 AM
  6. Mooncatt's Avatar
    I don't Know battery was at 47 percent and OP took it out and and boot up it was at 3 percent sound like battery to me
    The way she worded it made it sound like it went from 47% to 4% while was plugged in, then charged fine after the reboot (which could still be a cable issue if she picked up or moved the phone to do so, bending the cable in a way that established a good connection again).
    01-10-2020 11:25 AM
  7. mustang7757's Avatar
    The way she worded it made it sound like it went from 47% to 4% while was plugged in, then charged fine after the reboot (which could still be a cable issue if she picked up or moved the phone to do so, bending the cable in a way that established a good connection again).
    Possible could be 2 issues happening.
    01-10-2020 11:27 AM
  8. Rukbat's Avatar
    Still sounds like a bad battery to me. (You can totally kill a brand new battery in a month or two if you mistreat it, and this phone is a lot older than that.)

    @Lisa Kelsch, if you've been letting the battery drop down to less than 30% regularly, replace the battery.
    mustang7757 likes this.
    01-10-2020 01:46 PM
  9. Mooncatt's Avatar
    Even a bad battery would maintain an existing charge level when plugged in. I've seen ones bad enough that they only go to a certain point and seemingly stop accepting a charge, but never go down in charge level while plugged in. Plus, for a battery to get that bad, there would have been other symptoms long before that happened, namely drastically reduced usage time between charges.

    With no mention of other symptoms, I'm still thinking it's something else preventing a solid connection. Besides, it's cheaper and easier to try a new cable and check the port before a battery replacement.
    anon(10181084) likes this.
    01-10-2020 02:09 PM
  10. anon(10181084)'s Avatar
    @Mooncatt not necessarily. I know if I drop my tablet down to single digit battery level, shut it off and then turn it back on the next day (rarely do this), it shows a few percent less. Also, I remember on an old Windows 7 phone if it got too warm and rebooted automatically, the battery magically had next to no juice after the reboot despite being a relatively new battery.
    01-14-2020 04:55 PM
  11. Mooncatt's Avatar
    Also, I remember on an old Windows 7 phone if it got too warm and rebooted automatically, the battery magically had next to no juice after the reboot despite being a relatively new battery.
    That sounds like a dendrite, which is a temporary internal short that can cause this problem. They can occur even on a brand new battery.
    anon(10181084) and Rukbat like this.
    01-14-2020 05:07 PM
  12. anon(10181084)'s Avatar
    That sounds like a dendrite, which is a temporary internal short that can cause this problem. They can occur even on a brand new battery.
    But weirdest thing was that it drained normally in situations when the phone wouldn't overheat
    01-14-2020 06:39 PM
  13. Mooncatt's Avatar
    But weirdest thing was that it drained normally in situations when the phone wouldn't overheat
    A dendrite is a crystalline formation inside the battery. When it grows long enough, it shorts out internally, which causes the excess heat. It also acts similar to a fuse, being overloaded by the current and is destroyed in the process. After that, everything basically goes back to normal.
    anon(10181084) likes this.
    01-14-2020 07:00 PM
  14. anon(10181084)'s Avatar
    A dendrite is a crystalline formation inside the battery. When it grows long enough, it shorts out internally, which causes the excess heat. It also acts similar to a fuse, being overloaded by the current and is destroyed in the process. After that, everything basically goes back to normal.
    I thought the heat was from the SoC. Guess I was wrong.
    01-14-2020 07:07 PM
  15. Mooncatt's Avatar
    I thought the heat was from the SoC. Guess I was wrong.
    It would be impossible for the SoC to drain a battery that fast. By heat, I'm assuming you mean extremely hot to the touch, to the point you can't hold it?
    anon(10181084) likes this.
    01-14-2020 07:11 PM
  16. anon(10181084)'s Avatar
    It would be impossible for the SoC to drain a battery that fast. By heat, I'm assuming you mean extremely hot to the touch, to the point you can't hold it?
    No. It was but warm but not hot. My S8 (and especially my Tab S3) get much hotter under heavy use. The issue I described on the WP7 phone happened in either one of two situations. First was if I tried to video record for more than 11-15 minutes. The second one was if the phone would get warm for an extended time when browsing the internet (both on 3G and via Zune's built in reverse tethering).
    01-14-2020 07:22 PM
  17. Mooncatt's Avatar
    No. It was but warm but not hot. My S8 (and especially my Tab S3) get much hotter under heavy use. The issue I described on the WP7 phone happened in either one of two situations. First was if I tried to video record for more than 11-15 minutes. The second one was if the phone would get warm for an extended time when browsing the internet (both on 3G and via Zune's built in reverse tethering).
    I misunderstood you then, but could still have been a battery related issue in that case.
    anon(10181084) likes this.
    01-14-2020 07:25 PM
  18. anon(10181084)'s Avatar
    I misunderstood you then, but could still have been a battery related issue in that case.
    It probably was the SoC and loose solder joints (that phone was repaired after a 2 meter cat-induced fall). The HD2 had similar issues. But yeah, the symptoms are quite similar. My point was that something like this could also be happening to OP.
    01-14-2020 10:57 PM

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