Battery Reboot on Razr...

Discussion in 'Droid RAZR' started by Wopback, Nov 20, 2011.

  1. Wopback
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    Wopback New Member

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    Does anyone know if holding the power button and volume down at the same time, does a factory reboot (full reset) or just hard reboot? I reboot my phone when it starts to lag, but of course no battery pull here...can't even *228......anyone?

    Sent from my DROID RAZR using DroidForums
  2. rza49311
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    rza49311 New Member

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    factory reset is within the software, the power button/volume down just restarts the phone. rtm.
  3. Wopback
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    Wopback New Member

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    Awesome ......thanks for reply

    Sent from my DROID RAZR using DroidForums
  4. RETG
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    RETG Member

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    So if the software is FUBAR'ED, then the phone won't reboot? Know a few who had this problem with the iPhone. That is #1 on my concern list. #2 is radio (phone) reception strength.
  5. Dunc
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    Dunc New Member

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    FWIW, my Razr that I just picked up yesterday froze literally 20 minutes after walking out of store. I was changing my notification ringtone and everything froze. Did the power+volume down and it put it back to normal. It froze maybe once or twice again yesterday after that and both times it worked well. Hasn't happened since...now I just have the issue of it rebooting on its own, especially when it's plugged in.
  6. Wopback
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    Wopback New Member

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    Shouldn't do that this soon....you may want to return it

    Sent from my DROID RAZR using DroidForums
  7. Dunc
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    Dunc New Member

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    I'm going to give it a couple more days to feel it out a little more. It froze again last night shortly after I posted that last message lol. Also, both mornings after purchasing the phone it has been off even though it's plugged in. For whatever reason it likes to power down in the middle of the night. Thankfully the D1 I came from can be trusted to work as it should and be my alarm clock.
  8. rza49311
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    rza49311 New Member

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    This has been discussed quite a bit and this isn't the first android device without a removable battery. The Motorola Xoom works the same way and there hasn't been any trouble restarting it via the power/volume down combination.
  9. morcguy
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    morcguy New Member

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    Is it supposed to buzz like an angry wasp when you do the forced reboot?
  10. FoxKat
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    FoxKat DF Super Moderator Staff Member Premium Member

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    So given that it froze 20 minutes after purchasing, it's safe to assume you didn't power the phone off and charge it to 100% before using it. The problem may be related to battery charge level - that is actual level versus what the meter shows. Since these batteries are partially charged at the factory to about 50% so they don't drop into protection mode while on shelves, they don't get the chance to identify what a full charge is. This means the meter is guessing at the charge level from the moment you power the phone on.

    Then there's the problem of self-discharge while on the warehouse shelves. These batteries lose power even while sitting on a shelf. So if one was packaged in November, for instance, and then you buy it in March, it's been sitting in a box on a shelf for 4 months. That 50%, could actually be 20%. Problem is, the meter doesn't know that. It thinks it's still 50%, because that's what was in the battery when the phone was last powered down. So now you go to use it as you leave the store and 20 minutes later the actual power level of the battery is technically 0%, but the phone still thinks it's 20% or more, so because the voltage is too low, the phone starts freezing for "no apparent reason". After powering down and back up again a couple times, it still does it.

    Then it's rebooting on its own as well. These are all signs of a meter that doesn't know how much power the battery has and is overestimating the acutal state of charge.

    From Battery University (Battery Fuel Gauge: Factual or Fallacy? - Battery University):

    [h=2]Calibration[/h]The fuel gauge has the inherent drawback of needing periodic calibration, also known as capacity re-learning. This is done to correct the tracking error that develops between the chemical and digital battery on repeated charge and discharge cycles. Calibration could be omitted if the battery received a periodic full discharge at constant current followed by a full charge. The battery would reset with each full cycle and the tracking error would be kept at less than one percent per cycle. In real life, however, a battery may be discharged for a few minutes with a load signature that is difficult to capture, then partially recharged and stored with varying levels of self-discharge depending temperature and age.

    Manual calibration is possible by running the battery down until “Low Battery” appears. This can be done in the equipment or with a battery analyzer. A full discharge sets the discharge flag and the subsequent recharge the charge flag. Establishing these two markers allows SoC to be calculated by tracking the distance between the flags. For best results, calibrate a device in continuous use every three months or after 40 partial cycles. If the device applies a periodic deep discharge on its own accord, no additional calibration will be required. Figure 1 shows the full-discharge and full-charge flags.

    View attachment 48409

    Notice the discharge flag is NOT at 0% like many people try to convince the forum, but at 10% in this example? In the RAZR, it's 15% for good measure.

    So for us, a full charge at 100% with the phone off, followed by usage at a normal rate until "low battery", followed by another full charge and you'll have a proper level calibration. My bet is you wouldn't have suffered the issues if this had been done first.

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