build bard for li pol battery

Discussion in 'General Electronics Chat' started by mjd_76_09, Apr 26, 2014.

  1. mjd_76_09

    Thread Starter New Member

    Apr 26, 2014
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    hi every one im glade i found this amazing forum. its realy useful. i get a rechargeable battery for iphone from a friend. the board charge the battery but its not charge the phone. i dont wanna to fix this one. i want to use this battery to run my flash light its need four AA battery.
    can u help me please how to designe a board its charge the li-pol battery and run my flash light. but i dont wanna to destroy my light.
    thank u.
    this is the pic.
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  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Welcome

    When you said design, do you mean start from scrap ? :)
     
  3. mjd_76_09

    Thread Starter New Member

    Apr 26, 2014
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    thank u. if i can modify the current board i will not mind. if its easier to build from scrap please tell me how.
     
  4. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    It's not easy, believe me.

    Did you try googling for anything that might appeal you
     
  5. mjd_76_09

    Thread Starter New Member

    Apr 26, 2014
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    im searching from 3 days i couldnt find any thing. if there is a board sample i can find the component and solder it together.
     
  6. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    That battery in the picture is bulging.
    Check it, if it is like a pillow then you cannot use it. It's faulty.

    Second we need to know whether you have a lipo or li-on
     
  7. mjd_76_09

    Thread Starter New Member

    Apr 26, 2014
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    thank you for keeping up with me. the battery is not bulging. its perfect like new one. the mobile phone camera im using is too old. the battery is lipo. i dont wanna to charge the battery with AC 110v. i will use dc 5.0v charger.
     
    Last edited: Apr 27, 2014
  8. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    OK..Now you need to share some info about the capacity and no of wires coming out of the battery
     
  9. mjd_76_09

    Thread Starter New Member

    Apr 26, 2014
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    the battery has 2 wire black and red. its full charged. its give in those wire 4.11volt, 8.33a. capacity 2250mah. i want to use 5.0v or 3.7v dc charger too charge the battery, and over charge protect. and the flash light use 4pcs AA battery.
    [​IMG]
     
  10. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Then it is a 3.7V lipo. Fully charged will give u 4.2V.

    U cannot use 3.7V to charge unless you have boost circuit to increase the output.
    It will be easier to use a 5V PSU.

    Now it's up to u to do a home work.

    Search for Lipo charger circuits and learn about it's charge chemistry.

    I have not done a lipo charger but I did a Li-on charger for my battery drill.

    But I do not think it is impossible

    Try google and decided what appeals you. Then show us what you decided.

    I do not have time to design anything these days. I am in the middle of a project but I can advice on anything possibly. You need to do the hard part. It will help you to learn.
     
  11. mjd_76_09

    Thread Starter New Member

    Apr 26, 2014
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    thank u very much i will see what i can find then share it with u.
     
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