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?
     
  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.
     

    Attached Files:

  11. Pyro515

    Pyro515 Pen Pal - Newbie

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    These are all neat ideas, but I was thinking of actually making a dock like the original concept. Make a laptop keyboard base that will hold a spare battery. The biggest problem is the location of the power port, with it all the way up on the left hand side I think it will be hard to come up with a decent solution. The only thing I can think of is some type of bezel that the EP 121 sits in that will hide a cable running all the way down the unit.
     
  12. coldpenguin

    coldpenguin Scribbler - Standard Member

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    You could go all out......
    put an induction pickup on the back of the device, and have that sit into the dock :)

    Drool.

    Why did they have to split the slate and transformer? (Rhetorical question, don't want to change the topic!)
     
  13. heatlesssun

    heatlesssun Scribbler - Standard Member Senior Member

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    Not to change subjects as I think this is germane to the topics at hand but a dock for the EP121 is going to be a bit difficult as the unit weighs 2.6 lbs. A dock is going to have to be a bit heavy and will need to be well balanced to work well. I think it's possible but it's going to be a pretty heavy solution, at least 5 lbs. total weight including the EP121 itself.
     
  14. greygabe

    greygabe Pen Pal - Newbie

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    This is a slideshow of what I ended up with:
    ImageShack(TM) slideshow

    I did not wire the two XP18000s in parallel after all - just seemed too risky
    Also, this system allows me to just slide out one the the XP18000s and take it with my if I know it'll be a light day.

    I must say - I have to assume this is 10-15+ hours of simple web browsing and note taking. Most of my EP121 use is OneNote with lowest brightness and I have gotten multiple days without noticing I wasn't charging the battery pack...

    Let me know if you all have any questions. I think it's pretty self explanatory though...
     
  15. Edwood

    Edwood Scribbler - Standard Member

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    Nice DIY job, but looks quite ghetto and unneccessarily bulky, a lot of wasted space. But I think the XP18000's form factors have more to blame for that one.
     
  16. greygabe

    greygabe Pen Pal - Newbie

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    I kind of like the look - Makes people double take when they see wooden tech

    The box is just under .25" thicker than the thickest point on a XP18000
    And the LxW is actually not based on the size of the XP18000s, but the size of the EP121. The idea is that it is nearly identical to the EP121's LxW. This makes resting the EP121 on top of the device easy on an airplane tray or tabletop. I figure having it be smaller than the EP121 is useless since it just creates an annoying bulge in your bag whereas my box just sits in line with the slate.
     
  17. Edwood

    Edwood Scribbler - Standard Member

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    Would've been better if slim Li-polymer external battery like the defunct Electrovaya were available.
     
  18. haya-t

    haya-t Pen Pal - Newbie

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    Well, I would do a pocket there would also fit the keyboard. And maybe an external USB for an USB stick or maybe even two. Depends on the user.

    Sorry for not being able to do any graphics for it - I can't photoshop \:
     
  19. Mrono

    Mrono Scribbler - Standard Member

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    my idea ep121 case has a shoulder strap, slot for 1-2 xp18000, keyboard slot, and a space for the ep121 in the stock folio
     
  20. Grimspoon

    Grimspoon Scribbler - Standard Member

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    [​IMG]
    [​IMG]

    Pelican 1090 Interior Dimensions:
    15.00" x 11.32" x 1.92"

    EP121 Dimensions:
    12.3" x 8.2" x 0.7"

    Energizer XP1800 Dimensions:
    7.1" x 4.3" x 0.8"

    Looking at the specs, you MIGHT be able to squeeze 3x batteries on the bottom (2x for sure) and still have room to fit the ep121 on top of them within the unit.

    Think that would be a pretty tidy looking setup. Wonder if someone with CAD or a 3D imaging software could mock that up?

    Edit: The Pelican 1080 is the same design, just a bit smaller:
    12.80" x 9.80" x 1.70"
     
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