Backup Battery Pack Housing for EP121

Discussion in 'EP121 Slate' started by greygabe, Feb 6, 2011.

  1. greygabe

    greygabe Pen Pal - Newbie

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    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?
     
    Last edited by a moderator: May 18, 2015
  2. heatlesssun

    heatlesssun Scribbler - Standard Member Senior Member

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    I like the idea but how do you carry this and what is the total weight?
     
  3. SomeoneE1se

    SomeoneE1se Pen Pal - Newbie

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    both?

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

    greygabe Pen Pal - Newbie

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    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. SomeoneE1se

    SomeoneE1se Pen Pal - Newbie

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    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. heatlesssun

    heatlesssun Scribbler - Standard Member Senior Member

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    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.

    [​IMG]
     
  7. greygabe

    greygabe Pen Pal - Newbie

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    @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. Edwood

    Edwood Scribbler - Standard Member

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    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. coldpenguin

    coldpenguin Scribbler - Standard Member

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    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. rtp

    rtp I see you.

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    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.
     

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