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Thread: Calibrate Battery?

  1. Nice Guy
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    #11
    It seems that the best extended battery for the Bionic is the one made by Motorola in that the software plays nicely with it. I use the Bada$$ Battery Monitor (substitute 'ss' for '$$') as FoxKat recommends and it's accurate with the Motorola extended battery.

    When I had my OG Droid, I had a Seidio extended battery. No app would give a real reading, even Battery Left, which had a setting for the Seidio. In the end I used the Battery Left widget, but as it could give 3 lines of information, I put Voltage on top. I knew that if it was 4200mv it was charged and around 3500mv it was time to find a charger.
    Last edited by aaf709; 06-13-2012 at 01:49 PM.
  2. Droid Ninja
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    #12
    why not let it drain all the way instead of 15%?
    Don't get your tightie whities in a bunch if you don't like my humor or get offended when I skip putting smiley faces all over. IF you cannot handle online comments and get bent out of shape, go home.
  3. Nice Guy
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    #13
    Good question, It may have to do with the software figuring out when to issue a "Charge Now" warning. I'm sure FoxKat knows.
    FoxKat likes this.
  4. Master Droid
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    #14
    Boyfriend's having the same problem with the Seido 4000mAh battery. He's let it discharge and then charged up with the phone off several times, and it still stays on 1% for like 20 hours before it finally dies.
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    #15
    The heck with calibration. Tried them all, it still doesn't show correctly. Get the battery monitor widget. When my battery reads 3200 mV, I know the end is a few minutes away. Getting around 16-18 hours out of my vzw extended battery, using savings settings. Shut off data and Wi-Fi when not in use. Love the slimmer size(2760) vs the 4000, which is now sitting in my drawer.
  6. Super Moderator
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    #16
    Quote Originally Posted by nikecar View Post
    why not let it drain all the way instead of 15%?
    You can "technically" let the battery drain to 0% (where the phone powers down itself), however if the meter isn't properly calibrated to the battery (not the other way around), then there's a possibility that when the phone eventually shuts down the battery may actually be close to a critical level that will fail to respond next time you try to charge it. There have been many "bootlooping", "white light of death", "black screen of death", "power cycling" threads where they all originated from a phone that was allowed to drain and power down on its own.

    For the record, I've left my phone drain to 0 and power down a number of times with no negative consequences, but did so just to see if it would fail as others' have. Of course, my meter is properly calibrated to the battery so I felt confident it would respond as it did. I attribute the failures to the meter inaccurately representing more power at the nearly completely discharged level than the battery actually has, so the phone doesn't shut down soon enough to prevent deep discharging. So a healthy battery meter will result in the auto-power down executing at the right voltages and leaving enough power to allow for connecting to a charger later and being able to boot into charge only mode.

    Quote Originally Posted by aaf709 View Post
    Good question, It may have to do with the software figuring out when to issue a "Charge Now" warning. I'm sure FoxKat knows.
    Excellent deduction, Watson... The phone indicates "Low battery" at 15% (10% for Jelly Bean), for three very good reasons.
    1. That's when the voltages start to drop faster than it does over the previous 70% or so, and that's the indication that the meter is looking for to determine when it's approaching the cutoff voltage for full automated power down.
    2. That's a good level to warn you of impending doom (like the Low Fuel light on your car's dashboard), essentially telling you that you are now running on the "reserve tank". This way you have time to save any work you're actively working on, say goodbye to the person you may be on the phone with, finish that last text or email and send it, make the emergency call to warn the wife/husband/BF/GF that the phone is about to die, and get to the nearest source of power to replenish the phone's battery.
    3. It sets the flag for "Low battery" at that level, and then with that flag and the one it sets at 100% charged, can now make fairly accurate estimations of how much power is remaining anywhere along the discharge curve. Without those two flags, it would be guessing (inaccurately), and would begin to stray from the actual numbers farther and farther as time and power/charge cycles are completed.

    Quote Originally Posted by Laur3nNewm4n View Post
    Boyfriend's having the same problem with the Seido 4000mAh battery. He's let it discharge and then charged up with the phone off several times, and it still stays on 1% for like 20 hours before it finally dies.
    This is not so much a meter that's not calibrated as it is a battery that's not falling within the ranges that were spec'd for the phone, or in other words, a battery that's simply not 100% compatible. It may power the phone, but as you and others have found out, it will probably provide terrible level indications.
    Last edited by FoxKat; 06-22-2013 at 04:08 PM.

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    #17
    Quote Originally Posted by walkerstempe View Post
    The heck with calibration. Tried them all, it still doesn't show correctly. Get the battery monitor widget. When my battery reads 3200 mV, I know the end is a few minutes away. Getting around 16-18 hours out of my vzw extended battery, using savings settings. Shut off data and Wi-Fi when not in use. Love the slimmer size(2760) vs the 4000, which is now sitting in my drawer.
    This "workaround" is a viable one, and as long as you are monitoring the voltages and don't miss the threshold you've set for yourself (a safe one is the 3,200 mV or 3.2 V you mention), then the battery will still have sufficient power to remain ready to take a charge and resume powering the phone (+3 V). If the voltages drop much below 3 V, then the phone may fall into one of the bootlooping sequences I've mentioned, and recover can be quite a task. If the voltages actually manage to dip to somewhere between 2.5 V & 2.7 V, you may be looking at a battery that has gone into "protection mode" state and will not come out unless essentially "defibrillated" into normal state again. Some batteries can be recovered from Protection Mode, but not with the charger that comes with the phone. Instead it takes a very carefully monitored and executed series of jolts of substantially higher voltage to wake it from that state, and even those jolts may not be successful depending how deep the voltage has dropped. The only option left at that point is replacement.

    "Professor FoxKat"
    "Saving DROID Razr's, one battery at a time. :-)" - (credit SallyC)
    Avatar is Maxwell Smart, AKA Agent 86, from "Get Smart" (with his signature "Shoe Phone"), a SitCom TV series by Mel Brooks & Buck Henry, based on the spy thriller series, "The Man From U.N.C.L.E.".
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  8. Super Moderator
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    #18
    By the way, since this thread deals specifically with Smartphone Battery issues, I am moving it to the newly created Smartphone Battery Discussion forum. There will still be a link on the Bionic forum that will take you to the original thread in its new home.

    Moving now.

    "Professor FoxKat"
    "Saving DROID Razr's, one battery at a time. :-)" - (credit SallyC)
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  9. Droid
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    #19
    I am going to post my question here and hope for a response. I am pretty good about calibrating my OEM extended battery. When I travel though I switch back and forth between it and the standard battery that came with my Bionic. Will my battery meter be agitate when I do this? Not sure if its the. 905 update or not but I was locked in 3g using gps and after having a full charge I was down to 50% in about two hours and it stressed me out because my car charger wasn't working. Was it possibly just an error reading the battery?

    Sent from my DROID BIONIC using Droid Forums
  10. Super Moderator
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    #20
    I'm going to bet your suspicion is correct. For the meter to accurately indicate what the charge level is at any particular point in time, it uses the moving averages of the maximum charge level flag and the most recent 15% "low battery" flag, 10% with Jelly Bean. The problem becomes which battery was in when these level flags were set? Then once set for one battery, they are going to be inaccurate for the other.

    Sent from my DROID RAZR using Tapatalk 2
    Last edited by FoxKat; 06-22-2013 at 04:11 PM.

    "Professor FoxKat"
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    Avatar is Maxwell Smart, AKA Agent 86, from "Get Smart" (with his signature "Shoe Phone"), a SitCom TV series by Mel Brooks & Buck Henry, based on the spy thriller series, "The Man From U.N.C.L.E.".
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