Extended Battery Calibration

Discussion in 'Motorola Droid Bionic' started by TatDroid, Mar 19, 2012.

  1. TatDroid

    TatDroid Active Member

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    The good news: I got a great deal last week on Meritline.com for a 3100mAh extended battery for just $14.99 (free shipping, no tax). And more good news: it seems to last two full days under moderate to heavy use.

    The bad news: For the first 14 hours or so the battery usage will show as if the OEM battery were still installed - it will go from 100% all the way down to 1%. Then, for the next 24 hours it will continue to operate, showing 1% the whole time.

    I've been through two complete cycles - 100% down till the phone shuts down, then full charge back to 100%. Still doesn't track battery usage correctly.

    I'm bone stock. Anyone have any suggestions how to calibrate?

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  2. FoxKat

    FoxKat Super Moderator
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    This is exactly the same way my D2 responded to the 3100mAh battery. The solution is to not let it drain to 0% but instead to drain only to the low battery indicator. You will also need to charge to 100% with the phone powered off, so it's charge to 100% with phone off, use to 15%, charge to 100% with the phone off, and you should be good to go.

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  3. AdamPA1006

    AdamPA1006 Member

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    I would recommend rooting and getting the battery stats calibration app. It will delete the battery stats from your old battery!

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  4. FoxKat

    FoxKat Super Moderator
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    To suggest rooting to someone who is "bone stock" is potentially a recipe for disaster. Also, wiping stats leaves you with no top or bottom levels set. You then still have to train the battery meter to the capacity of the battery which requires the same process I described, and the end result is the same, so why root to accomplish the same goal if it doesn't save you anything or provide any different results?

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  5. TatDroid

    TatDroid Active Member

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    Interesting, so FoxCat you're saying I should shut down when it says 15% remaining? (when actually it has over 24 hours of life left?) I have been charging it in "power off" mode, but I've been intentionally waiting until it drains all the way and shuts off - which is a pain, since I never know exactly when or where that will be, since it reads 1% remaining for a full day of use. I took it off the charger at 8:00am Sunday morning, and it just shut off at 8:30 tonight (Monday), so that's 36 hours. (which is why I'm writing this from my Transformer - the Bionic is on the charger) And that's with some pretty heavy use. Loving the battery life - just need to get this battery usage indicator thing figured out so I'll actually know how much battery I have left!

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  6. Tillers_Rule

    Tillers_Rule Member

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    Battery monitor widget let's you manually input the battery specifications.

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  7. TatDroid

    TatDroid Active Member

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    It's been over a week now. I've cycled this battery every way I can think of. No change. Battery meter goes from 100% to 1% in the first 14 hours. Then goes another 20 - 24 hours, showing 1% battery left the whole time.

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  8. lykofos

    lykofos Member

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    I'm going to go out on a limb and say it's an an issue with the discount battery itself that you bought. I have the official moto extended battery and have swapped it back and forth with the regular battery multiple times and it has read the battery usage correctly without any superstitious snake oil battery recalibration techniques needed. The whole battery calibration needing to be done when swapping batteries is a complete myth.

    Battery Calibration is a Myth - xda-developers

    No Need to Calibrate Android Battery | TweakMyDevice
     
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  9. aaf709

    aaf709 Nice Guy
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    There may be some truth in that. When I had the OG Droid I got the Seidio extended battery. The battery indicator was always off. It would say I needed to plug in when I still had hours left. At that time I used the Battery Left widget. It gives you 3 lines of information and the first line I had was voltage. I knew that ~4200mV was charged and ~3500mV I should find a charger. Even so you can see that Battery Left didn't do a real job with that battery (and it even had a setting for the Seidio) because it too said the battery was dead long before it was.

    When I got the Bionic, and the Moto extended battery, I didn't need that. I chalked it up to Gingerbread vs. Froyo, but it may be more than that.

    It's possible that the Moto extended battery plays well with the Bionic circuitry and any other is iffy.
     
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  10. TatDroid

    TatDroid Active Member

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    Yes, I'm beginning to realize this must just be a problem with a non-Motorola battery not reading correctly in a Motorola phone. I have no problem with the battery itself (36 hours under medium use), so I guess I'll just have to deal!

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  11. FoxKat

    FoxKat Super Moderator
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    This information is correct with respect to the battery, but we also need to take into consideration the fact that batteries lose capacity over time whether used or not, and the expected usable lifespan of a LIPO battery is about 3 years from date of manufacture. At that time, the battery will only be able to take a charge of about 70% of original capacity. So if you are expecting 100% of original capacity 3 years later, and charge to 100% of capacity for that time in the battery's life, when you reach 30% of original capacity and you haven't "trained" the battery meter to what is the acutal (now lower) capacity, the meter may in fact say there's 30% left when in fact you are approaching 3V (effectively 0%). Using it much longer could result in a voltage that is too low (2.5V-2.9V) to start the phone (bootlooping), and also too low to start the charging circuitry (BSOD on boot), and even possibily low enough that the battery goes into protection mode (around 2.5V - 2.7V).

    BatteryUniversity.com disputes some of the information contained in those threads, and I would rather rest my head on the opinion of the world's expert on battery testing, CADEX, rather than on any forum or web publisher. The truth is the battery meter can not maintain 100% accuracy to the capacity of the battery and so needs to be "trained" to quote BatteryUniversity, to the actual reduced capacity of the aging cell.
     
  12. FoxKat

    FoxKat Super Moderator
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    TatDroid, the very fact that it says 1%, but lasts MUCH longer than it should proves the battery and battery meter are out of sync. I have a D2 and bought an extended battery (3,300mAh knock-off) for it as well. I experienced the same results with that battery. However once I ran it through the cycles I mentioned, it now represents the battery capacity nearly accurately.

    The charging circuitry needs to learn what the max and min are, so it can then stretch its range to fit the battery's new and much larger capacity.
     
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