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Battery level drops 30-40% immediately after removal from chargerSupport

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  1. Brocktune

    Brocktune Member

    I've read some similar threads but I haven't been able to piece together what is happening with my phone.

    This started last Thursday. I've had the S3 for several months and have gotten into a routine of putting it on charge overnight (while still on.) Thursday morning when I got to work I noticed the battery indicator was already down to 60%. Normally this early in the morning it is still in the high 90s. I brushed it off and thought maybe I forgot to charge it the night before.

    Friday I noticed that as soon as I disconnected the charger, on which the battery level was showing 100% charged, it instantly dropped to 69%.

    Saturday, Sunday and Monday the phone charged normally overnight.

    Tuesday morning - battery level is showing 100% while connected to charger, dropped instantly to 58% after disconnected. I quickly went into the settings to what the battery stats indicated. When I went back to the home screen the battery showed 100% again. However by the time I made it to work 1 hour later, the indicator was already down to 51%.

    Do I have a bad battery, does it need calibrated? Any ideas?


  2. ryancalif

    ryancalif Well-Known Member

    That's definitely not right.

    I would consider factory-restoring the phone. If that doesn't work, look for a replacement battery online.

    edit: um, switch that around... find replacement battery first (inexpensive), THEN do a factory restore if that doesn't work. :D
  3. Putty

    Putty Well-Known Member

  4. valorian

    valorian Well-Known Member

    Sounds like a defective battery.
    Russ71 likes this.
  5. ylexot

    ylexot Well-Known Member

    +1 I'd take it to the store and see if they'll replace the battery under warranty.
  6. Brocktune

    Brocktune Member

    Thanks for the replies.

    Probably heading to the Verizon store tonight to see what they have to say.
  7. Hrethgir

    Hrethgir Well-Known Member

    Yeah, definitely sounds like a cell in the battery shorted out on you, replace that thing!
  8. Brocktune

    Brocktune Member


    Stopped at the Verizon store after work. They said they needed to recreate the problem by testing how much charge the battery would take. The total process takes an hour so I declined.

    Called the Verizon Warranty Center and the tech instructed me to turn the phone off to charge it overnight. This worked (battery fully charged and working normally) but it's not an acceptable long term solution for me.

    My suspicion now is that due to the poor signal strength where I live (the suburbs but apparent Verizon dead zone) the wall charger simply can't overcome the phone's amped-up call standby power consumption.

    I am going to do some more investigation when I get home. From what I have read the wall charger is rated for 1A output, however due to cheap construction and cable losses the actual output at the phone could be 0.5A or 0.6A. I also read somewhere that the S3 has a circuit that limits incoming current to 0.9 Amps to avoid battery damage. I am thinking that a better wall adapter and cable might provide more current and give me a full charge overnight.

    This still does not explain why the phone says 100% and then instantly drops to 60% when unplugged.
  9. GTWalling

    GTWalling Well-Known Member

  10. Brocktune

    Brocktune Member

  11. FelipeMoralesB

    FelipeMoralesB Active Member

    You're also not supposed to charge a battery overnight from what I've heard that damages the battery.
  12. dfran1

    dfran1 Well-Known Member

    boy you learn something new everyday

    I did a search on this and this is what I found

  13. Szadzik

    Szadzik Well-Known Member

    Urban Legends begin!

    It cuts off the current the moment it gets to full.
  14. Hogan773

    Hogan773 Well-Known Member

    I always set an alarm to wake up at 2:00am to pull my phone off the charger. Then I wake up again at 5:30am to put it back on the charger, since it has had a parasitic loss during those 3.5 hours. Then when I wake up at 7:00am I am ready to take it off again.

    This way I ensure that my battery isn't being damaged, and I am not taking away 2 days worth of its total life over the next 3 years, even though I'll probably have a new phone in 1.5 years, and also even though I could buy a replacement battery on Ebay at that point for $10 or so.

    Now where is the icon for sarcasm for me to add to this post.......:D
  15. Szadzik

    Szadzik Well-Known Member

    You spread urban legends and damage your sleep time by waking up a few times during the night. I keep my phone one the charger for the whole night and can assure you it does not get damaged. Leave it one night and you will see, that it stops charging when full
  16. Brocktune

    Brocktune Member

    Update: After several weeks of trying things, here is what I found...

    1st idea was to turn off 4G in hopes that the phone would not drain the battery as it was charging. I didn't have high hopes for this but it was the easiest thing to try. Worked for a few days and then the issue happened again.

    In the meantime I installed the Battery Monitor Widget to see what exactly was going on. What appears to happen is that the battery attempts to charge but does so very slowly. After about an hour of only going from 62% to 69%, the battery all of a sudden jumps to 100%. It must be something that is programmed into the phone. Maybe they figure if you see it is at 100% you will unplug it and when when you plug it back in it will be on a better charger.

    2nd idea was a better charge cable. I picked up a 3ft shielded cable from Monoprice and have not had the false charge issue since I have been using it. It provides a noticably faster charge than the cable included with the phone.

    Problem is solved for now.:)
  17. irenelove

    irenelove New Member

    I promise that's not a permanent solution my phone keeps doing that and I have gotten 3 new battery's and7 different chargers from different brands and nothing works completely I have looked and looked and nothing will fix it.

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