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  1. #11
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    No, that's not measurable. That's your estimates based on your usage pattern which changes day to day.

    The normal tendency is to buy a tablet, use the hell out of it for a while. Then the novelty wears off and you start using it in a normal pattern, which extends your run time because you are not trying every single thing it has on it.

    Do a full charge to 100%. Run it till the warning shows, and then record Time on Battery (Its at the top of the screen in Settings / About Tablet / Battery use). Do this for three days in a row.

    Re-Enable those modules and do the same recording for three days.

    You will find that there is no real difference. Its all perception, and when you look at the data it disappears.

    I have no clue what's wrong with your runtimes.

    I get 24 hours and 22 minutes with my usage pattern (recorded by Battery Left), and that includes a lot of Angry Birds play time and web surfing, mail reading.

    The most anyone has ever seen in Battery use display is about 12% attributed to the Cell Standby. So how do you claim 25% improvement by saving 12%? That should have been your first clue that your perception was off.

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  3. #12
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    You say the "most anyone has claimed is 12%" and yet I exceeded that claim by claiming 20-25%? I have seen still others claim between the two.

    Of course being someone who usually operates on fact and not blind belief you got me curious enough to run some re-producible tests that I could offer you as proof positive that battery life is extended. If I am wrong I will be the first to admit it and retract the post.
    Last edited by Epyx; 05-31-2011 at 03:59 PM.

  4. #13
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    Quote Originally Posted by Epyx View Post
    You say the "most anyone has claimed is 12%" and yet I exceeded that claim by claiming 20-25%? I have seen still others claim between the two.
    No, what I meant is the 12% is all that ever showed up in Battery Use statistics after a typical day of use.


    Note: Just to be sure we understand that display, what we see there is the breakout of the battery used since last full charge, not the percentage of battery capacity. Its a subtle difference.

    Example:
    Charge to 100%.
    Power on and use it for two minutes.
    You have hardly touched the battery at all.
    Yet Screen will probably account for 90% of usage. Which means 90% of that tiny percent of actual battery drain.

    So if your tablet sits completely unused, that tiny drain allocated to Cell Standby can become a big number (maybe even approaching 50%), even tho the battery use is tiny, and the battery is still showing 95% charge.

    People get all excited about this and cry "Why is cell standby using all my battery", when in fact it doesn't affect run time very much at all.

    So.... Getting back on track...
    The numbers in Battery Use display are very misleading at first glance, and if you say you saw a 25% increase in runtime that has to be measured with a clock, with total disregard to the numbers in battery use.

    The only number in there that makes any sense is the "Time On Battery". At battery exhaustion, the percentages might mean something, but not until then.


    --- Edit: I'm sure you know the about those Percentages and how meaningless they are, I'm just posting this so new users will find it and understand that they are not something to get excited about.

    Still wondering why you can't get more than 8 hours.
    Last edited by Icebike; 05-31-2011 at 04:53 PM.

  5. #14
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    Put mine in airplane mode, charged it up, battery stats still show the cell standby usage at 12%

    Sent from my A500 using Android Tablet Forum

  6. #15
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    Quote Originally Posted by kes601 View Post
    Put mine in airplane mode, charged it up, battery stats still show the cell standby usage at 12%

    Sent from my A500 using Android Tablet Forum
    Yes, I'm doing that also but it still shows cell standby at 7%, which is what I have been getting from day one! Haven't had it on long enough to see if there really is a battery savings or not.

    Gerry

  7. #16
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    Mine too. Airplane mode with wifi on doesn't solve the issue on my end. I'm not rooted, newest OTA

  8. #17
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    Quote Originally Posted by Icebike View Post
    There is no user who as demonstrated any measurable battery saving via EITHER method.
    Both of these posters over at xda reported significant increases in battery duration after renaming (effectivly disabling phone and Telephony apk) :
    xda-developers - View Single Post - WARNING: Do not rename the phone or Telephony apk!!!!
    and...
    xda-developers - View Single Post - WARNING: Do not rename the phone or Telephony apk!!!!

    If you look at my own post here dated 5/16/2011 (Gps??) I ran my GPS (with wifi off) from home to work using Copilot. I charged the battery overnight- booted the tablet while in my driveway- and closed Copilot when I arrived at work. In that post I reported my battery was at 88% when I arrived at work.
    Last night after renaming the phone and telephony.apk files I fully charged the A500 again- booted it up in the driveway, disabled the wifi and started Copilot. Drove the same route I take to work every day. When I arrived at work this morning my battery was at 91% capacity.
    OK, so it was only a 3% decrease in battery use with phone and telephony.apk disabled - but it was only a 50 min trip. You could possibly see greater energy savings on longer duration runs.

    To say "There is no user who as demonstrated any measurable battery saving via EITHER method" isn't quite accurate- I just sited three reports- two secondhand and one firsthand.
    Rooted Nook Color- Ultimate Droid @ 925Mhz (*****) Keeper!
    Acer A500 rooted! (*****) Keeper!
    Craig CMP 738a (for $70 it's good enough!)
    Coby MID 7024 returned- defective audio circuit
    Galaxy Tab 7"- returned- too expensive for 7" tablet
    Huawei Ideos S7- returned- bricked after 3 days use

  9. #18
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    Rooted Nook Color- Ultimate Droid @ 925Mhz (*****) Keeper!
    Acer A500 rooted! (*****) Keeper!
    Craig CMP 738a (for $70 it's good enough!)
    Coby MID 7024 returned- defective audio circuit
    Galaxy Tab 7"- returned- too expensive for 7" tablet
    Huawei Ideos S7- returned- bricked after 3 days use

  10. #19
    Bec
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    Ouch, that rooting and renaming remains the only effective way.

    Do updates still work after rooting?

  11. #20
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    Quote Originally Posted by Bec View Post
    Ouch, that rooting and renaming remains the only effective way.

    Do updates still work after rooting?
    We've only had one update from Acer so far and I had no problem with it on my rooted A500.
    Of course I renamed the two apk files back to their original names before accepting the update.

    Again- if you're not comfortable with rooting, renaming system files- or don't understand the risks... don't do it.
    The battery life gains are minimal and if you screw up and forget to rename the original files before updating or factory resetting your A500- you risk bricking your A500!!
    Rooted Nook Color- Ultimate Droid @ 925Mhz (*****) Keeper!
    Acer A500 rooted! (*****) Keeper!
    Craig CMP 738a (for $70 it's good enough!)
    Coby MID 7024 returned- defective audio circuit
    Galaxy Tab 7"- returned- too expensive for 7" tablet
    Huawei Ideos S7- returned- bricked after 3 days use


 
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