Bad battery performance Onda v711 and jellybean

Discussion in 'Onda Tablet Forum' started by Red7, Jan 8, 2013.

  1. Red7

    Red7 Member

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    Hi, I updated my V711 to jellybean and rooted using iiDiabolusZz 's guide. It works great but my battery sucks.

    I am getting only about 4 hours of battery life reading a book with wifi off and about 50% brightness or less. Web browsing or games/videos suck down the battery in no time, maybe an hour or so. Also, the battery takes forever to charge, about 3-4 hours in a home 110v ac wall socket.

    After JB I tried using the "battery calibration" app. Didn't notice a difference. I also tried Juice defender. And although it had some neat features, my battery is still running out way to quickly.

    Any ideas? Thanks.
     
  2. speedway

    speedway Member

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    Same problem here.
    How long did it last on one charge before the update?

    I think the battery on these tablets are awfull. I bought my dad a jiayu G3 and his phone will last for 48 hours with 3G and Wifi on, using it normally... Why arent these tablets which have double the battery size according the Onda site able to at least reach 6-8 hours browsing or reading?!
     
  3. leeshor

    leeshor Senior Member

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    Some pre JB tablets had apps that were not completely compatible with JB. Any apps installed prior to JB may have left junk in the system so things may indeed not work correctly, including the charging. However, a factory data reset is one way to normally solve the problem.
     
  4. Red7

    Red7 Member

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    My tab was originally received running ICS not JB. I did a full reset, update to JB, and root.

    Checking my apps, the only two aside from keyboard and system stuff is facebook and google maps. Facebook doesn't really surprise me but Maps is shown running twice and I never launched it. I updated maps first, now I may try just installing Maps altogether to see if that helps.

    So I just ran the tab playing a movie continually until it died. Wifi on and streaming through Netflix, I watched Tranformers (dark moon) with the screen brightness at about 33% but volume up at 100% running earbud headphones (I actually watched the movie).

    The 14% battery left warning came on at about 2 hrs in. Then the 4% soon after at about 2:20. The movie finished at 2:35 and I restarted it to see how much longer it would last. It ran for another 15 minutes on the last "1%" of battery. Total play time of 2:50 and total on time of 3:05 from turning of fully charged to dead.

    So fist off, the battery meter seems a bit off as the end of the battery lasted longer than expected. But, this is still really poor battery performance compared to reviews showing the Kindle Fire streaming movies at 50% brightness continually for 6.5hrs.
    I wouldn't expect it to last as long as a phone, as the large screen sucks down a lot more power. But it should be on par with other 7" tabs like the kindle and the nexus it was designed to compete against.

    Cnet tests tablet batteries:
    CNET tablet battery life results | Android Atlas - CNET Reviews
     
  5. leeshor

    leeshor Senior Member

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    Google maps had a bad battery consumption issue nearly a year ago and uninstalling the update had solved the problem. But I'm not saying that's where the issue is now,
     
  6. Red7

    Red7 Member

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    I'll try it again tonight with Maps removed.

    I charged it up and it took 1.5hrs to charge fully. Here's the thing, I noticed the charger has a rating (5v 1000mA). So to me that would mean 1000mA x 1.5hours = 1500mAH battery capacity!

    I just looked at the Onda website and can't find any battery specs for the V711 but newegg lists it as being 2400mAH. That would be 50% more capacity than what I think I am getting. That would change 3hrs to 4.5hrs of playback, that would at least be acceptable.

    Is it possible to replace the battery with a better higher cap battery?
     
  7. Red7

    Red7 Member

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    Ok, I stopped maps (can't uninstall) and stopped facebook too. Ran the same movie and it died at the same time as before, about 2:50 of video playback.

    Looking further into the Onda chinese site, they don't list the V711 battery size. I can only assume that it is the same as in the V712 which is listed as 3000mAH.
    Since I am really curious, I decided to crack it open and take a look at the battery inside. Unfortunatly, no mAH rating here either. If anybody can find any info on this battery through the numbers, that would be awesome.

    Look:

    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]

    The battery measured ~143x53mm

    If anybody finds a good hi-cap replacement, let me know.
     
  8. iiDiabolusZz

    iiDiabolusZz Senior Member

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    Last edited: Jan 10, 2013
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  9. Red7

    Red7 Member

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    Hmm Ok thanks Diabolus. Nice find on the battery, that's only $7.71 USD + shipping. I wonder if it would be any different in performance though.
    So is Jellybean sucking down more power than the 1.5 ICS? I thought it was supposed to be more efficient.

    I downloaded the BMW app and will play with it for a couple days. I also saw this: USB 5600mAh External Battery Backup Power Bank Charger for Tablet iPhone HTC | eBay
    That would be a pretty easy (but ugly) solution anyway.

    Really 4-5 hours on 1.5? Man, I like JB, but maybe I should just roll back to 1.5 and try that.
     
  10. speedway

    speedway Member

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    I suppose the v712 and v711 are based on the same design and hardware except for the screen? So the battery would also fit in a V712?

    Only thing is... you never know if the advertised 4000mah is true, might be the same 3000mah...
     
  11. blitz76

    blitz76 Member

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    Hi, I was doing my research on the V712 battery and I found this V711 vis-a-vis V712
    It is in russian but it can translated by chrome. I just don't know if it is really the V712, I dont want to open mine. HTHs :)

    I also found some chinese online store that sell V712 battery, but for some weird reason, I can put the link here but when clicking on it it does not point to the product.
     
    Last edited: Jan 11, 2013
  12. Red7

    Red7 Member

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    True the 4000mah may not be a real 4000mah battery. But my 3000mah battery is only holding about 2200mah, just guessing off of charge times. If I can figure out how to use their order form, I think I'll order one up. It's only $10 to try anyway.


    Wow, that is very surprising. So the V711 and V712 are actually very different. Different boards, screen, and battery.

    I found the V712 battery. They have just 2 models of it from what I can see; 1500mAH or this 2500mAH: http://item.taobao.com/item.htm?spm=a230r.1.10.108.zbUOhC&id=16378881532
    Slightly bigger dimensions for the Vi30 but 5000mAH: http://item.taobao.com/item.htm?spm...a138-5f6a85b4d42c&ad_id=&am_id=&cm_id=&pm_id=
     
    Last edited: Jan 11, 2013
  13. iiDiabolusZz

    iiDiabolusZz Senior Member

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  14. Red7

    Red7 Member

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    For the sake of completeness I thought I would paste this here. I added this to another thread and think there is some good info in there.
    Also, I have the replacement battery on the way. It should be another week before it even gets here but I'll come back here and post results then.

    Here is a link to the battery: taobao agent , ,taobao english , taobao paypal
     
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  15. iiDiabolusZz

    iiDiabolusZz Senior Member

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    Hope it solves the issue for you, did the agent add much to the total?
     

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