Anyone knows how to add battery to a YBox2?

Discussion in 'General Electronics Chat' started by BestFriend, Sep 23, 2010.

  1. BestFriend

    Thread Starter Member

    Sep 22, 2010
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    Well, I'm bored so I decided to create a portable yBox2. Maybe anyone knows how to add batteries into the board?

    If yes, please include step by step procedure =) here's the ybox2 http://www.ladyada.net/make/ybox2/solder.html
     
  2. retched

    AAC Fanatic!

    Dec 5, 2009
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    Wouldn't be tough at all, the problem would be the amount of batteries you would need for adequate usage.

    If you wanted more than 5 to 10 minutes out of it, you cant use a standard 9v battery.

    6D cells might give you a decent runtime.

    Or, some of those newfangled LiIon or LiPo batteries could provide the juice.

    What is your target runtime?
     
  3. BestFriend

    Thread Starter Member

    Sep 22, 2010
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    Hopefully 1 day or 24 hours. What LiIon batteries should I get?
     
  4. retched

    AAC Fanatic!

    Dec 5, 2009
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    Hold your horses. ;)

    First we have to take a look to see if there are any current draw numbers available for the ybox2.

    If so, it is some quick math to determine what battery capacity we need.

    If not, we have to take a look at the schematic and see what the average part draws are and make an 'educated' guess.
     
  5. BestFriend

    Thread Starter Member

    Sep 22, 2010
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    Alright, I don't know about the current draw numbers but they provide the schematics here: http://www.deepdarc.com/ybox2/
     
  6. retched

    AAC Fanatic!

    Dec 5, 2009
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    Ok, according to her site, the ybox2 is happy with 5-9v DC and requires around 250mA of current.

    Are you sure you want to do this? The ethernet and propeller uC require a good amount of juice... But for the sake of answering your question...

    Enegizer D cell rechargeable NiMh pack around 2500mAh of juice.

    If you use 6 of these, you get around 1.2v * 6batteries = 7.2v and 2500mAh

    The datasheet shows around a 10 hours life (to .9v per cell) with a 250mA draw.

    Considering the ethernet will fluctuate usage.. You might get 12 hours from the batteries.

    So, if you used 12 D cell batteries, putting 6 in series and connecting that pack to another 6 in series via parallel connection, you should get 24 hours from the device.

    Then an hour or so to recharge, and do it again.

    Here is the datasheet on the batteries:
    http://data.energizer.com/PDFs/NH50-2500.pdf
     
  7. BestFriend

    Thread Starter Member

    Sep 22, 2010
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    Thanks! The battery is rather quite expensive though. I'll need 6 2pc pack and that'll cost around $72. Anyway, before I buy it, is there any more cheaper alternatives?

    Ow, I've got some spare Nokia Cellphone rechargeable batteries, will that work? The back of the battery says 700mAh 3.7V 2.6Wh
     
    Last edited: Sep 23, 2010
  8. retched

    AAC Fanatic!

    Dec 5, 2009
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    No.. You will need around 5000mAh.

    This device was not designed to operate off batteries.

    What could work is one of those 7.2v (or larger) Remote Control car/plane/boat battery packs. That should have the guts.
     
  9. Audioguru

    New Member

    Dec 20, 2007
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    They are very expensive. They simply have a little AA cell inside. So use their AA cells instead and they cost less.

    They recently made their Ni-MH battery cells hold a charge much longer and then the capacity was reduced to 2300mAh now.
     
  10. marshallf3

    Well-Known Member

    Jul 26, 2010
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    You're stepping into the area where you need a motorcycle or UPS gel cell batttery.
     
  11. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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  12. marshallf3

    Well-Known Member

    Jul 26, 2010
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    Shipping can kill you on these things, there are usually local sources.
     
  13. BestFriend

    Thread Starter Member

    Sep 22, 2010
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    Hmmm, makes me wonder how Amazon can price the kindle at around $150 when batteries already costs half.
     
  14. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    They sure don´t cost that much to manufacture.
     
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