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Support Battery Charge

Discussion in 'Android Devices' started by eazy401, Jun 16, 2011.

  1. eazy401

    eazy401 Member
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    Any one else find that if they turn the phone off and charge via USB the battery gets a better charge. By better charge I mean that when turned back you dont see a rapid percentage drop in the first few minutes
     

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  2. mcl1981

    mcl1981 Well-Known Member
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    Well duh. When it stops charging, there is nothing on to draw it down.
     
  3. eazy401

    eazy401 Member
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    i am asking about the difference mainly between using the USB cord and plugging it into the computer vs the AC adapter and the wall.
     
  4. sitlet

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    USB charges slower, so theoretically you should be able to get a bit more of a charge out of it.
     
  5. Needforspeed

    Needforspeed Well-Known Member
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    So what would be better for the battery
     
  6. Halfbaked

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    Doesn't matter how you charge the phone. The EVO does trickle charging so the battery will never overcharge. Once the battery hits 100%, the phone won't allow the charger to begin charging again until around 90%.
     
  7. Needforspeed

    Needforspeed Well-Known Member
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    Would it be better to charge it when its off
     
  8. eazy401

    eazy401 Member
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    i see a huge difference in battery life when charged via the USB vs the ac adapter. The USB charge seems to more thorough and its seems to hold a charge a lot longer. For example fully charged with USB and phone off 4 hours later i am still +90% with texting and phone calls. If charged via AC adapter i am at 90% within minutes of unplugging the phone. This is not my imagination. There has to be something to this.
     
  9. Needforspeed

    Needforspeed Well-Known Member
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    I'm gonna try it thanks 4 the tip
     
  10. mcl1981

    mcl1981 Well-Known Member
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    You're all seeing things. Charging with a USB source vs an AC source has no effect on how long your battery will last or when it will stop charging. It all depends on WHEN YOU UNPLUG IT. And there is no way to determine what it is presently doing without the battery monitor widget.
     
  11. eazy401

    eazy401 Member
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    I have the widget installed and can see the percentage points drop remarkably faster with the AC adapter
     
  12. mcl1981

    mcl1981 Well-Known Member
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    I don't think you are grasping this. The only thing USB vs AC changing does differently is... NOTHING. It is nothing more than an indicator on your screen. Current flowing into the battery is current flowing into the battery. It will flow as fast as the phone's regulator allows and up to the maximum capacity of the charger, whichever is lower. Whether it comes from a wall transformer that indicates AC or USB, or it comes from the computer that indicates USB. It is the same. A 500ma AC indicating changer will do the same thing as a 500ma USB indicating charger. Any notion that one is different or better is a fantasy. The differences you are seeing have nothing to do with AC vs USB.
     
  13. eazy401

    eazy401 Member
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    i get what your saying, but why when i charge via AC adapter and I unplug within minutes I am in the 80% but if i charge with USB i am in the 90's for hours. Same usage
     
  14. mcl1981

    mcl1981 Well-Known Member
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    What you are saying has no scientific value to anything.

    Charging by AC could mean your using an AC wall adapter. But that AC adapter could indicate AC or USB to the phone depending on if the data pins are shorted or not. So just because you're using an AC adapter doesn't mean the phone is seeing it as an AC charger.

    Charging by USB could mean your plugged into a computer. But it could also mean you're plugged into an AC adapter that doesn't have the data pins shorted and it will still indicate USB.

    A 500mah AC adapter is not going to do anything any different than a 500mah computer USB port. 5v at 500mah is 5v at 500mah regardless of what it is plugged into and what the phone thinks it is.
     
  15. eazy401

    eazy401 Member
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    I do not understand why when I charge my phone with it on it says its full and I unplug it within minutes I am in the 80% range. The only way it seems to get my phone fully charged is to charge my phone with it off. Any ideas or suggestions would be greatly appreciated
     
  16. ocnbrze

    ocnbrze DON'T PANIC!!!!!!!!!
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    i do what they call a bump charge. basically you charge the phone to it is 100% or overnight. in the morning i unplug and power off. recharge it while it is off until the light turns green. unplug it again and power it back on. once booted up replug until fully charged. this usually gives me a full charge and i do not see the immediate drop like some people do right after unplugging.
     
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  17. mcl1981

    mcl1981 Well-Known Member
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    Or just root and install an SBC kernel. It will always be fully charged, none of this stopping and starting crap.
     
  18. eazy401

    eazy401 Member
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    ok i am new to all of this I am rooted and running the Fresh Rom. What is an SBC kernel and how do I go about doing that
     
  19. mcl1981

    mcl1981 Well-Known Member
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    Which Fresh Rom, Froyo or GB?
     
  20. mcl1981

    mcl1981 Well-Known Member
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  21. eazy401

    eazy401 Member
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    i am using Gingerbread 4.1.1.0
     
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  22. mcl1981

    mcl1981 Well-Known Member
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    Ah, well you're temporarily screwed. There is no custom kernel for a GB based rom. HTC has not released the source code yet so there is no ETA on one either.
     
  23. harleyless

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    My "AC" charger from HTC (USB adapter) charges 1.0A @ 5v where as the USB charges 500mA @ 5v. Its been my experience too EAZY401 that for what ever reason the battery likes to be charged with less current for a longer period of time.
     
  24. mcl1981

    mcl1981 Well-Known Member
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    BTW, You'll never actually be putting 1000ma (1a) into the battery. Even with the 1a charger, you'll never get more than 800ish. Between cable loss and the current the phone actually uses to function, 800ish is about the max you'll ever charge with. Your 500ma rated chargers will suffer the same reductions.
     
  25. harleyless

    harleyless Member
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    So EZ was correct in his findings that the "wall" charger charges twice that of the usb? 1a - loss of 20% = 800mA and 500mA - loss of 20% = 400mA
     
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