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  1. #1
    Soundwave
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    49736
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    Dec 2012
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    TF300T
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    Keyboard dock drains extremely fast

    Hello.

    When I plug my device into my PC to transfer data (I connected it via the keyboard dock attached to the tablet), my keyboard dock's battery drains extremely quickly. I went from 84% to 74% in about 5-10 minutes.

    Even in normal usage my keyboard dock's battery seems to drain extremely quickly. What's the deal?

  2. #2
    TRANSFORMER FORUMS LEGEND
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    It could be that during that time it was also recharging the tablet.

    The way the TF300 charging system works is like this (assuming 10% battery drain from any battery in an hour, and zero charging ineffeciencies between the dock and keyboard):

    Dock.jpg

    The pair will use the tablet battery until it reaches 70%, then recharge with the dock battery. Assuming the batteries are the same size, over the course of an hour the dock battery will lose about 30% of its power recharging the tablet (20% recharge, 10% usage over the hour) so the dock battery will step down to zero, but when it does discharge it will do so quite rapidly as it is charging the tablet battery.

    Be sure to check out the app Dual Battery Widget as it can help you see the level of the two batteries and plot them out.


    Asus Transformer 16 GB & Dock - Munching on Jelly Beans
    crApple iP*one 5 - Stock

    Just once I want someone to call me Sir without adding you're making a scene.
    - Homer Jay Simpson

  3. #3
    Soundwave
    Member #
    49736
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    Dec 2012
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    TF300T
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    Quote Originally Posted by Frederuco View Post
    It could be that during that time it was also recharging the tablet.

    The way the TF300 charging system works is like this (assuming 10% battery drain from any battery in an hour, and zero charging ineffeciencies between the dock and keyboard):

    Dock.jpg

    The pair will use the tablet battery until it reaches 70%, then recharge with the dock battery. Assuming the batteries are the same size, over the course of an hour the dock battery will lose about 30% of its power recharging the tablet (20% recharge, 10% usage over the hour) so the dock battery will step down to zero, but when it does discharge it will do so quite rapidly as it is charging the tablet battery.

    Be sure to check out the app Dual Battery Widget as it can help you see the level of the two batteries and plot them out.

    Thanks for the reply. My dock seems to start draining even before my tablet reaches 70%. It starts draining at around 85%.

  4. #4
    TRANSFORMER FORUMS LEGEND
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    2978
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    Jun 2011
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    Interesting. I would install Dual Battery Widget and add it as a widget to your home screen.

    Check the graph of the battery drain (tap the widget to open it)


    Asus Transformer 16 GB & Dock - Munching on Jelly Beans
    crApple iP*one 5 - Stock

    Just once I want someone to call me Sir without adding you're making a scene.
    - Homer Jay Simpson

 

 

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