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Making DC battery Power

Discussion in 'Electronic Basics' started by Meanie, Jul 5, 2013.

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  1. Meanie

    Meanie Guest

    I asked a question about batteries and DC power adapter a few weeks ago
    and now I have a small (I hope) dilemma.

    I am using the advice of a cordless battery pack and charger to power my
    wife's yarn spinner. I purchased a charger for a tool I already have to
    eliminate buying more accessories. Therefore, I bought this second
    charger >>>[email protected]/9213411868/lightbox/ with
    plans to gut it and wire the two contacts for power, which you'll see
    here >>>>[email protected]/9213411570/lightbox/

    The general idea was to remove the wires to the contacts and solder an
    adapter cord which fits the insert of the spinner, thus, direct power.
    Upon disassembling the charger, I quickly discovered those contacts are
    soldered to the circuit board, but also, I was thinking about those
    three other prongs which the battery makes contact with, which you'll
    see in these photos >>>[email protected]/9213411700/lightbox/[email protected]/9213411794/lightbox/ You'll
    see the two straight-up prongs to the left and the three loop prongs to
    the right. My plan of direct wire contact is not what I expected and now
    I'm uncertain how to do this.

    Anyone care to offer advice how to achieve my objective?

    Thank you
  2. I do not understand the problem.
    Soldering two wires cannot be that difficult.
    Of course you need tools like soldering iron, 40/60 solder, and flux.

  3. Meanie

    Meanie Guest

    Allow me to elaborate on my objective.

    The wife uses an electric yarn spinner, which obviously, already has a
    power cord w/transformer(120v to 12v). She wants the option of using the
    spinner without the cord when there isn't an outlet available (ex:
    Outside). Therefore, I decided to make her a battery powered adapter and
    choose to use a 12v battery from one of my cordless tools. I purchased
    an extra charging pack, which you saw in the photo. My plan is to gut
    the inner components to disable the charging feature and simply use the
    charging station as a battery holder and power supply. Thus, I need
    those prongs to remain in the case after I've removed the circuit board.
    Obviously, I no longer need the circuit board because I don't need it to
    charge. What I need is a case with the prongs attached to it so I can
    insert the battery for connection. Since the prongs are part of the
    circuit board, they won't be available on the case for me to solder
    wires for the spinner. The only thing I can currently think of is to
    remove the prongs from the circuit board and adhere them on the case.
    Then I would solder two wires from a connector which fits her spinner
    and I'm good to go. Though now, after viewing the three loop prongs, I'm
    uncertain of their function and how I would wire them along with the
    other two straight prongs.

    I hope I explained it better.

    Thank you
  4. I think I got some of that 40/60 soler. Decades back, I got some solder
    that sure didn't work, and I soon tossed it. I have no idea if it was
    somehow a bad batch, or I accidentally bought the wrong kind, it's been so
    long. But it sure wouldn't solder electronics properly.

  5. Possibly high temperature solder?

    At my workplace I had the first place after the entry door.
    Every now and then somebody would come in and ask for a piece
    of solder. Then I found some solder which looked almost like normal
    solder but would melt some 20 degrees higher.
    Friendly and helpful as I am I generously provided the collegs with
    what they needed.

    Soon that ended.

  6. As I understand it you will charge the battery in another charger.

    You want to use a surplus charger as battery holder only.
    You don't have to disable the charging feature.
    Just leave it on its place and add the two wires
    to the battery contacts,
    The idling charging circuitry will not take much power
    off the battery. Maybe one LED will light, cut that off.

  7. Meanie

    Meanie Guest

    That is correct.
    Correct and supply the power to the spinner.
    Is it ok to solder the two wires on the underside of the circuit board
    where the prongs/contacts are?

    I assume it's ok to cut the power cord also?

    Thank you
  8. Meanie

    Meanie Guest

    I didn't want it to appear like a cheesy rigged contraption with a
    battery laying down with wires sticking out of it.
  9. Jasen Betts

    Jasen Betts Guest

    Ooh! lithium ion. that stuff is easily damaged.
    the extra contacts are for balancing the cells in the battery during
    charging, and for monitoring temperature etc... AIUI you don't need
    them during discharge, but with lithium you can damage the battery if
    you deplete it too much, I'm not sure how best to protect against that.

    easiest way to re-purpose the device is to cut the tracks on the
    circuit board and solder wires to the underside of the contacts.

  10. As someone said, you may cut the traces underneath the print
    which lead from/to the contact springs. This is 110% safe.
    I use a carpet knife and/or a small Dremel for that job.
    Be sure to leave enough trace to mechanically hold the contact
    springs, cut in a centimeter distance.
    Also cut the power cord, of course.

  11. Meanie

    Meanie Guest

    On 7/4/2013 9:53 PM, Meanie wrote:

    Thank you all for your help.
  12. Meanie

    Meanie Guest

    That's what she does. She purchases the wool or hair, spins it into yarn
    then knits clothing. She also has a manual spinners and still uses it,
    but the electric spinner is compact and easily transportable.

    If we had the yard space, she would seriously consider purchasing Angora
    sheep and rabbits......seriously, that's not a joke. I'm thankful I
    bought a small home.
    Normally, I tend to agree.

    Her: "Going out to the gazebo to do some spinning"
    Me: "Ok, extensions cords are in the garage"


    Unfortunately, as I stated, she goes elsewhere. Besides, she's lazy when
    it comes to simple endeavors. The damn woman runs several miles a day
    and works out, yet is too damn lazy to pick up the simplest item.

    Yes, I can relate.
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