High Battery Wear?

Discussion in 'Microsoft' started by jhoff80, Dec 14, 2013.

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  1. jhoff80

    jhoff80 Pen Pro - Senior Member Senior Member

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    Pretty much overnight on Thursday, my Surface Pro 2 is now showing a full capacity of 22,533 mWh, (out of 42,002 mWh) despite only having a cycle count of 26. (From powercfg /batteryreport) My guess is that the circuitry is just confused about the size of the battery, so yesterday, I tried to drain it until the PC hibernated and then charge it overnight, and that has had no effect on bringing it back where it should be.

    Anyone else know of any solutions for recalibrating the Pro 2 battery? Or seen abnormally high battery wear before?
     
  2. zhewy

    zhewy Pen Pal - Newbie

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    Mine went back to normal by itself at next batteryreport. Others have been finding a reset was needed.

    Try this (for Pro only):

    1. Shut down.
    2. Hold vol + and power button for 15 sec. Surface logo may flash etc. but don't let go for 15 sec.
    3. Let go of both buttons
    4. wait 10 secs.
    5. Press power button to start up.
     
  3. JoeS

    JoeS I'm all ears Senior Member

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    Wow, that's terrible. I just checked mine, and it shows 6% battery wear (39.5 Wh capacity out of 42 original) after 28 cycles. Pretty bad as well, no idea how this happened.
     
  4. jhoff80

    jhoff80 Pen Pro - Senior Member Senior Member

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    That did the trick, thank you. It's now back to a much more reasonable 2%.
     
  5. e-schreiber

    e-schreiber ƒ(x) / fashion Senior Member

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    Avoid recharging beyond 90%.
    Avoid discharging beyond 10%.

    Avoid recharging before reaching 20% depletion.
    Avoid discharging before reaching 80% charge.

    Perform battery calibration 3-4 times a year in Safe Mode to get around the Standby/Hibernation mechanisms built into the Power Plans.
     
  6. JoeS

    JoeS I'm all ears Senior Member

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    But then again, does anyone really stick with these? I violate all of them by mostly keeping the SP2 plugged in. So maybe I deserve that 6% wear..
     
  7. excalibur1814

    excalibur1814 Scribbler - Standard Member Senior Member

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    I try to ensure that the batteries on my various HP laptops are looked after in case I decide to sell. I don't, however, EVER start to recharge until it literally begs me to recharge at around 4%. So far none of the batteries, when tested using the HP battery check tool, state that the battery life has changed that much or if at all. Maybe some of this is purely... Luck.
     
  8. DragonGamer

    DragonGamer Pen Pal - Newbie

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    Some people over at the surface forums experiecned this drastical drop after the recent firmware update which went wrong.
    MS will hopefully repair that soon...
     
  9. JoeS

    JoeS I'm all ears Senior Member

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    Last edited: Dec 14, 2013
  10. e-schreiber

    e-schreiber ƒ(x) / fashion Senior Member

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    I guess keeping it plugged yields no battery depletion, so it shouldn't be a problem.
     
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