DIY: change asus vivotab note 8 battery

Discussion in 'Asus' started by mael112001, Feb 25, 2015.

  1. Brian Steele

    Brian Steele Pen Pal - Newbie

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    1. I used this battery - https://www.amazon.com/gp/product/B00WWHT708

    2. I haven't done anything special on the tablet for battery to be recognized. Note: my tablet is running Windows 10, which I understand has a built-in routine for calculating battery capacity and lifetime. Right now it's telling me that the battery has a charge capacity of 6,975 mWh, which is considerably lower than the 15Wh rating of the new battery. However, given that it's indicating the battery's serial number as "123456789" and it's telling me that the battery has already gone through 433 cycles, I suspect that tablet is still using some information from the original battery in the report. I will check it in a week or two to see if anything changes.

    PS: I generated the battery report using this command - powercfg /batteryreport /output c:\battery_report.html
     
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  2. Yoyo

    Yoyo Scribbler - Standard Member

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    The cycle count is a little worrisome, as is the 7,000 mWh figure. I hope the new battery really has more muscle than that (should be about 15000 mWh) and the tablet just needs to calibrate to use its full potential.

    Supposedly battery utilities need to cycle all the way from fully charged to flat occasionally to give accurate results, documented here for Windows laptops generically:

    http://www.tomsguide.com/faq/id-2342991/calibrate-battery-windows-laptops.html

    Have you tried anything like this?
     
  3. Brian Steele

    Brian Steele Pen Pal - Newbie

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    I did do a full discharge / recharge cycle, but it didn't seem to change much at the time. However I just ran the powercfg report again and it's saying that as of the 31st of May the estimated full-charge capacity is 8,525 mWh. That's still lower than the design capacity, but a bit more than what was reported on Saturday. The run-time estimates were way off for awhile, but seem to be getting closer and closer to what I'm actually experiencing with the tablet. Right now it's estimating a run-time of 3 hours and 37 minutes at 99% capacity, which is disappointing compared to what I was getting with the tablet when it was new, but a marked improvement over what I was getting from tablet just before replacing the battery. And now the battery is a lot easier to replace, so I might opt for one of the other battery sources the time it's time to replace it.
     
  4. BenGman

    BenGman Pen Pal - Newbie

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    Nice writeup!

    Can you tell me what settings you used on the LiPo charger and on which wires of the batteries you connected (close up picture please) ?

    My charging/OTG port is busted for a second time... based on your pic I am wondering if I can route the battery leads outside the case and charge the battery externally... or better yet have a second battery charged externally and just swap batteries in and out of the tablet.

    Please advise!
     
  5. Yoyo

    Yoyo Scribbler - Standard Member

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    Looks like its my turn for this. After five years almost to the day of daily use my Vivotab note 8 has a totally dead battery and is still irreplaceable.

    Anyone know a good source for batteries in the present?
     
  6. Yoyo

    Yoyo Scribbler - Standard Member

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    It has gotten weirder. My backup Asus now won't charge either, but has a strong battery. Tried every charger and cable I can find, neither will gain percentage on the charge indicator. ???
     
  7. thierryb

    thierryb Scribbler - Standard Member Senior Member

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    Your usb port could be broken. Did you check that point ?
     
  8. Yoyo

    Yoyo Scribbler - Standard Member

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    My tablets are alive, both of them, and charging again. So I'm happy, but it gets curiouser and curiouser...

    Evidently I have several 'bad' USB cables that used to work fine, and my older tablet will now not charge at all on phone sized chargers it has always worked with in the past.

    My solution is to use the factory power bricks and a cable that oddly works.

    If the port is failing the problem is intermittent, partial, and happened to both tablets at the same time. Could be the port has a contact that doesn't wotk well with some cables? Not sure, but I'll try to look into that if the problem gets worse.

    I sure wish these antiques were not still the state of the art...
     
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