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Author Topic: Very simple question...: battery holder  (Read 986 times)
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Hi, I have a very basic question, but I want to be sure that I won't blow anything up...
For a battery holder like in the image below (that can hold 8 AA batteries), can I just put some wires on the places where I drawed (yes in Paint  smiley-cool ) blue lines to make a 4 AA battery holder of it?

Thanks for your help!
Bram
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I don't think you connected the grounds, Dave.
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You could do that, or you could
A) add one wire
B) move one wire
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Measurement changes behavior
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In theory yes, but in practice I think you might find it somewhat difficult soldering wire jumper(s) as the metal of the contacts and springs on some don't work well with normal solder. Also when completed you should really measure the resulting voltage with a multimeter to make sure the pack is generating the voltage you expect. Such meters are available very inexpensive and are a 'must have' for any work with an arduino project.

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Sure, you should also be able to just connect a single wire from the last battery to the last one you want connected. Check things with an ohmmeter if you want to be sure.
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As well as finding the spring contacts are difficult to solder too, you may also find that the heat of the soldering iron melts the plastic.
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I don't think you connected the grounds, Dave.
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You may find you could thread the bared end of the wire through the coils of the spring, to be held in place by the presence of the last battery.
It depends on how reliable you need the arrangement to be.
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Or just find or make brass or copper rods the same size as AA cells and there you go.  smiley-wink


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If you have a Radio Shack nearby (that is still open), I would be tempted to wander down there, and see if they have a 4 AA holder.

I've seen people making fake batteries for using external power for camera flash units, by getting an appropriate sized wooden dowel, and drilling it, and installing a metal pin of the appropriate size (and the last battery, actually has the wires to connect to the external battery).
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Or just find or make brass or copper rods the same size as AA cells and there you go.  smiley-wink

I have an even simpler solution.

I simply stick some fired .308 Win cases in the holder instead of batteries.
Approx the same diameter, and less than one millimeter longer.


* image.jpg (117.48 KB, 800x597 - viewed 28 times.)
« Last Edit: March 18, 2014, 03:58:24 pm by Peter_I » Logged

Bob Pease: "My favorite programming language is ... solder."

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I don't think you connected the grounds, Dave.
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Quote
Bob Pease: "My favorite programming language is ... solder."
Steve Ciarcia
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Quote
Bob Pease: "My favorite programming language is ... solder."
Steve Ciarcia
God.... that is an old one...... I remember his articles in Byte in the old days  smiley-mr-green
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I don't think you connected the grounds, Dave.
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I suspect Bob Pease was even older.
I loved his articles, even if most of the time, I didn't understand the subtilties of analogue design.
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Quick, chuck it in the bin before the boss finds out...
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Back on topic, you can buy dummy batteries for this purpose. Look like (or at least similar to) a battery but it's just a metal strip from one end to the other!

I've just picked a listing at random:

http://www.ebay.co.uk/itm/12-pcs-Pack-Dummy-Battery-AA-Size-Conduct-Conductor-Electric-Current-Ultracell-/181182376696?pt=LH_DefaultDomain_0&hash=item2a2f4faaf8
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Denmark
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Quote
Bob Pease: "My favorite programming language is ... solder."
Steve Ciarcia

Bob Pease
I picked it up from here: http://www.ti.com/ww/en/bobpease/index.html
(But whether he made it up or picked it up, that's a good question)
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Thanks for the mass amount of answer and for the history of Steve and Bob  smiley-razz
I'll try to solder it, if I mess up, I'll just buy another one. They're so cheap smiley and I'll measure the Vout with a multimeter at school before I juice my 2 hacked servo's (360°) with it.

If you have a Radio Shack nearby (that is still open), I would be tempted to wander down there, and see if they have a 4 AA holder.
We don't have that shop in Belgium. Everyone is always talking about Radioshack on this forum smiley-sad
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