Backup Battery Pack Housing for EP121

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  1. #1
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    Default Backup Battery Pack Housing for EP121

    So I wanted a magic box for my EP121
    This box is the size of the EP121 length and width so the device can sit on top of it easily (perfect for an airplane food tray) or the box could easily fit in a backpack behind the EP121. The box would provide an extra 8-12 hours of extra battery. The box would not require too many extra cords to carry around - just the box.

    Here's what I ended up with

    A 3D rendering of the project idea

    A top-down size comparison of the EP121 laying flat on the box

    The Energizer XP18000s and their power supplies in the box
    I know - bad Photoshop. My 2nd XP18000 is in the mail

    Finished box with both cord straps open and cords exposed
    Note: There are two holes in the top yet to be cut for access to the
    battery status and 'on' button on top of the XP18000)

    Access port for USB charging (usually hidden under velcro strap)

    Basic wiring diagram (XP18000s are in parallel)

    This also replaces the need to carry around the EP121s own adapter since the power supplies for the XP18000s can charge both themselves and the EP121s internal battery simultaneously.
    What do you all think? Nice accessory for the EP121 or ridiculous pet project?

  2. #2
    Pen Pro - Senior Member
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    Default Re: Backup Battery Pack Housing for EP121

    I like the idea but how do you carry this and what is the total weight?
    Samsung Series 7 XE700T1A-A04US 11.6-Inch Slate (128 GB, Win 7 HP)
    HP TouchSmart tm2t-1000 CTO
    HP Slate 500
    Toshiba Libretto W100
    ASUS Eee Slate EP121 64GB SSD/4 GB RAM
    Lenvo X220T ~ Core i7-2620M ~ 8GB DDR3-1333 ~ 320GB @ 7200 RPM

  3. #3
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    Default Re: Backup Battery Pack Housing for EP121

    Quote Originally Posted by greygabe View Post
    What do you all think? Nice accessory for the EP121 or ridiculous pet project?
    both?

    It's a nice idea but the form is too brick like. What's the weight?

  4. #4
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    Default Re: Backup Battery Pack Housing for EP121

    Weight is about 10lbs (keep in mind that includes its power supplies and removes the need to bring along the EP121's power supply)

    It's definitely not intended for everyday - just the once a week or so you know you're going to have a long day on battery

    The thickness is the thing that annoys me most, but it's limited by the thickness of the power brick. Only 1/4" thicker than that.

  5. #5
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    Default Re: Backup Battery Pack Housing for EP121

    1/4"*2
    or
    1/8"*2

    you might want to custom fabricate a plastic box and then uncase the bricks could save up to 1/2"

  6. #6
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    Default Re: Backup Battery Pack Housing for EP121

    Here's another idea that is similar and should be simpler. The idea is to simply attach the XP 18000 to the folio. I was thinking some sort of case that holds the battery and clips securely into the flap of the folio.

    Samsung Series 7 XE700T1A-A04US 11.6-Inch Slate (128 GB, Win 7 HP)
    HP TouchSmart tm2t-1000 CTO
    HP Slate 500
    Toshiba Libretto W100
    ASUS Eee Slate EP121 64GB SSD/4 GB RAM
    Lenvo X220T ~ Core i7-2620M ~ 8GB DDR3-1333 ~ 320GB @ 7200 RPM

  7. #7
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    Default Re: Backup Battery Pack Housing for EP121

    @SomeoneE1se
    It's 1/8" * 2 - Surprisingly sturdy considering its thickness
    I was considering opening the power bricks but I got real nervous...


    @heatlesssun
    I'd be concerned about the weight of it on the flap...
    Also, you would have to carry the charger separately which I'd rather not have to worry about... If I took the power supplies out of my box though it would have probably been thinner than the EP121...

  8. #8
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    Default Re: Backup Battery Pack Housing for EP121

    Nice cheaper solution at the expense of adding a lot of weight and bulk.

    I'd like a nice thin and flat Li-Polymer battery pack that's the same foot print size of the EP121.

  9. #9
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    Default Re: Backup Battery Pack Housing for EP121

    And they'll let you on a plane with that?

    In the UK, you can't get on if you have an open cup of coffee!

  10. #10
    rtp
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    Default Re: Backup Battery Pack Housing for EP121

    Why not just make pockets onto the back of the folio provided? one side with battery and one side with external HD. Pockets stitch and a velcro cover to keep them in place. Would have a much cleaner look. Anyways just my 2cents.
    See pics bellow. Two pics shown without flap just for clarity. *Not actual reprentation of connections, just a rough ideal.
    Attached Images Attached Images     
    Last edited by rtp; 02-06-2011 at 04:50 PM.
    Asus Eee Slate EP121 64GB 4GB RAM
    500GB External HD / 32GB SDXC
    Pentax K7 tethered DSLR

 

 

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