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Thread: Barebones Single-Cell Lithium-Ion/Polymer Charger

  1. #1
    Flashaholic* Sabrewolf's Avatar
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    Default Barebones Single-Cell Lithium-Ion/Polymer Charger

    I have been getting questions about the length of this sale... It will go on until forever

    Here we go again!

    This time i want to offer all you Diy'ers a standalone
    Lithium-Ion/Polymer battery charger board that you
    can integrate into your own project.

    If you wanted a fully assembled, Ready to go unit:
    http://www.candlepowerforums.com/vb/...d.php?t=240090

    Specs:

    : Fully Current Regulated.
    : Pre-Charge rate for batts under 3.0v
    : Cutoff at 4.2v
    : Green led to indicate Charge/Power Status
    : Voltage input range from 5v to 7v
    : 100mA or 300mA charge rates
    : Dimensions .400/10mm x .300/8mm x .120/3mm
    : Thru-Hole pitch .100/2.5mm
    : Pin size .040/1mm
    : Short-Circuit Protection
    : Absolutely NO Reverse battery protection !
    (Please don't attempt to use a diode to block
    the reverse battery condition because it will
    cause the charger to overcharge the battery)

    The Green status led will turn on when power is applied to the circuit and/or the battery is being charged.
    And it will turn off when charging is complete or it is short-circuited.

    More specs and wiring layout are in the picture below:


    I will be selling these how they are pictured above.

    Price is 20$ with Continental US shipping included (no insurance)
    International Shipping is extra (please inquire in a PM)

    They will be built as demanded, No waiting (unless i dont have the parts on hand)

    I take Paypal, Personal/ Busness Checks, and Money Orders.
    Please PM me for my address if needed for checks.

    Paypal/Email: robertkmagill @ hotmail.com
    Last edited by Sabrewolf; 09-25-2009 at 10:45 PM.

  2. #2
    Flashaholic* Sabrewolf's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Payment List

    Saabluster Paid 8/30/2009 Shipped 9/10/2009
    MWClint Paid 9/1/2009 Shipped 9/10/2009
    Ma_rine_sa Paid 9/15/2009 Shipped
    NutSak Paid 12/01/2009
    Last edited by Sabrewolf; 12-04-2009 at 12:15 AM.

  3. #3
    Flashaholic* csshih's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    wow, that thing is tiny.

    such a tiny chip can do the proper CC/CV algorithm.. so why can't *fire integrate it into their chargers??

  4. #4
    Flashaholic* saabluster's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Quote Originally Posted by Sabrewolf View Post

    Price is 20$ with Continental US shipping included (no insurance)
    International Shipping is extra (please inquire in a PM)
    This is some good stuff. I'd like one. Let me know when and where to send payment.

  5. #5
    Flashaholic* Sabrewolf's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Quote Originally Posted by saabluster View Post
    This is some good stuff. I'd like one. Let me know when and where to send payment.
    These will be built up fairly quickly.. Maybee this week, Along with the
    little USB chargers I also put my email addy in the first post

  6. #6
    Flashaholic* saabluster's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Quote Originally Posted by Sabrewolf View Post
    These will be built up fairly quickly.. Maybee this week, Along with the
    little USB chargers I also put my email addy in the first post
    Cool. Are you ready to receive payment? If so I will shoot $20 bucks your way right now. Thanks, Michael

  7. #7
    Flashaholic* Sabrewolf's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Quote Originally Posted by saabluster View Post
    Cool. Are you ready to receive payment? If so I will shoot $20 bucks your way right now. Thanks, Michael
    Yup, Payment is allready a go

  8. #8
    Flashaholic* saabluster's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Quote Originally Posted by Sabrewolf View Post
    Yup, Payment is allready a go
    Incoming

    Edit:
    Last edited by saabluster; 08-31-2009 at 01:49 AM.

  9. #9
    Flashaholic* saabluster's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Surely I'm not the only one that can use one of these. Come on people.

  10. #10

    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger



    Payment sent for 1 circuit.

    this is good stuff..thanks for offering these!

  11. #11
    Flashaholic* Sabrewolf's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    No one else interested in one of these to integrate into their project?

  12. #12

    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Quote Originally Posted by Sabrewolf View Post
    No one else interested in one of these to integrate into their project?
    these circuits are simple to use and tiny! I'm surprised more people aren't buying them.

    Just finished wiring one of these little guys in a small 4xAA project box from
    radio shack. Added a selectable 100<->300ma switch and a Batt OFF/USB <-> On switch.
    Charged a couple IMR batts, works well. very convenient.





    cut the top off a 5mm led and mouted it topside, the status led on
    the charger circuit shines right thru.



  13. #13
    Flashaholic* Sabrewolf's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Very Cool !!!

  14. #14

    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Thanks Sabrewolf,

    Check this out.
    integrated voltmeter.


    grabbed a couple of these circuits off ebay for ~$5
    (am i allowed to post the ebay link? if not just pm me..or search ebay for subject of
    "RC Lipo battery Voltage Indicator voltmeter (1S-6S)")

    seems to work well, it matches the readings of my dvm, so that's a good sign. playing around with it right now..in the end, i'll mount it properly and
    probably add a small switch to turn the display on/off.

    open batt circuit with the charger on shows 4.20v coming out of the charger.


    charger off, testing batt voltage.

    turning the charger on at this point, the voltage jumps to 4.02v under charge, as shown in the first pic.
    Last edited by MWClint; 09-28-2009 at 06:21 PM.

  15. #15
    Flashaholic* Sabrewolf's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    VERY Nice! I love it when projects come together

    I should pick some of those up from dealextreme..
    Thanks for reminding me

  16. #16
    Flashaholic* csshih's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    dang.. that is COOL!

  17. #17
    Flashaholic* csshih's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    mwclint.. got any pics on how you did that thing?
    I wouldn't have the soldering iron/parts to do it.. but that's just cool!

  18. #18

    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Quote Originally Posted by csshih View Post
    mwclint.. got any pics on how you did that thing?
    I wouldn't have the soldering iron/parts to do it.. but that's just cool!
    thx!

    here's a quick and dirty drawing of the circuit..shows switch layouts and stuff.


    current iteration. extended and made the usb cable detatchable.
    nylon washer to keep magnet leads separated.


    computer audio header for attatching voltmeter.


    usb cable and voltmeter display dont need to be plugged in for charger to work.


    some notes:
    -4xAA power doesnt like 300mA charge rate.. it can get batts to about 3.98v..but then i have to flic the switch to 100mA to go higher.
    older laptop usb port same thing...new laptop and A/C usb adapter work fine on either 300/100 setting.
    i think the 300mA setting doesnt like it when the 4xAA pack voltage is under 5v...its fine when the AA's are fully charged..5xAA might be optimal.
    -AW li-ions stop around 4.16v.. IMR's stop at exactly 4.20... fine by me.
    -i'm using this thing more than my Triton now.. haha
    -it's always on my desk charging something. coworkers like the display.
    -one dude said it looks like a homemade bomb timer thingy.
    -if i turn the charger on, with no li-ion(open circuit), and it doesnt show 4.20v, i know there's not enough juice in the 4xAA pack for charging.
    it's like a self test
    Last edited by MWClint; 10-04-2009 at 03:19 AM.

  19. #19
    Flashaholic* Sabrewolf's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Very nice setup!

    I would love to see someone get through the line at the airport with that!

  20. #20

    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Edit, nm i just read the max1555 datasheet and answered most of the questions i had for you. lol. I though there was a lot more parts to this thing. Pretty neet cuircuit. Why is the led resistor so big? Do you have 1uf bypass capacitors on the other side? The datasheet recomends them, are they really needed? What are they for?
    Last edited by mpteach; 11-11-2009 at 08:50 AM.

  21. #21
    Flashaholic* Sabrewolf's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Quote Originally Posted by mpteach View Post
    Edit, nm i just read the max1555 datasheet and answered most of the questions i had for you. lol. I though there was a lot more parts to this thing. Pretty neet cuircuit. Why is the led resistor so big? Do you have 1uf bypass capacitors on the other side? The datasheet recomends them, are they really needed? What are they for?
    If you are running the circuit from a clean power source, Then nope Those extra components are for power filtering..
    Not necessary to use them if not needed. Heck, I couldnt fit them in the Usb connector anyways.. Not enough room.
    Last edited by Sabrewolf; 11-11-2009 at 11:09 PM.

  22. #22
    Flashaholic* Sabrewolf's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    An update.. Nutsak's charger goes out with the usb chargers tomorrow
    And here is a the newer, Cleaner Layout of the board
    All parts are potted in norland to protect the wires and such.
    Although the solder holes/pads are left uncovered



  23. #23
    Flashaholic* NutSAK's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    I received it on Saturday. Thank you! The new layout is very clean!
    - Terry

  24. #24
    Flashaholic* Sabrewolf's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    Quote Originally Posted by NutSAK View Post
    I received it on Saturday. Thank you! The new layout is very clean!
    Woohoo! Thanks

  25. #25
    Flashaholic* Sabrewolf's Avatar
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    Default Re: Barebones Single-Cell Lithium-Ion/Polymer Charger

    I have to close this thread and Re-Open it on the Marketplace
    So i will post a new link for it when i redoo the thread

    So i hate to say it.. But this Thread is Closed

    New Linky!!
    http://www.cpfmarketplace.com/mp/sho...d.php?t=215400
    Last edited by Sabrewolf; 02-18-2010 at 06:50 AM.

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