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Old 09-30-2007, 05:24 PM #1
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Default AAA dummy batteries: where?

I just bought a PC-linked digital multimiter. Now I would measure the current of my flashlight and my laser while they are turned on.
Since they use 2xAAA and it's very difficult to reach the "+" of them, I thought that the perfect solution would be to put inside it 2xAAA dummy batteries and to put outside the 2xAAA real batteries in an external battery holder.
Does anyone know where I can buy the AAA dummy batteries?


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Old 09-30-2007, 06:22 PM #2
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Default Re: AAA dummy batteries: where?

I made my own out of a piece of garden cane with a brass screw pushed into one end *and a brass washer the other end, with wires soldered to them, one of which passes up throught the hollow cane....It works fine for the external supply I am using...

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Old 09-30-2007, 06:42 PM #3
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Default Re: AAA dummy batteries: where?

Quote:
Originally Posted by rog8811
I made my own out of a piece of garden cane with a brass screw pushed into one end *and a brass washer the other end, with wires soldered to them, one of which passes up throught the hollow cane....It works fine for the external supply I am using...

Regards rog8811
Wow, very cool!
Can you please take a picture of it? (english is not my first language and I didn't understand exactly what you used...)
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Old 09-30-2007, 07:13 PM #4
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Default Re: AAA dummy batteries: where?

Here you go
Attached Thumbnails
AAA dummy batteries: where?-battery_spacer01.jpg  
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Old 09-30-2007, 09:38 PM #5
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Default Re: AAA dummy batteries: where?

ahah great! thanks!!
1 out of 3 is clarified now. :-X
My limited intelligence still doesn't understand what's that washer thing.. I understand the word "brass", the word "thick" and the word "washer" but I can't unify them and associate them to that thing represented in the picture!
I also saw in Google Image for "brass washer" but didn't help (many images of different things!)
I'm a total goat
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Old 09-30-2007, 09:41 PM #6
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Default Re: AAA dummy batteries: where?

A washer is basically a metal disk with a hole in it... fits around a bolt, usually underneath a nut
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Old 09-30-2007, 11:22 PM #7
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Default Re: AAA dummy batteries: where?

Ahhhh! got it now! thankssssss for the enlightenment!

Wow, now I must say that rog8811 is an excellent craftsman! ;D
I doubt that I can realize it such a complex tool
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Old 09-30-2007, 11:41 PM #8
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Default Re: AAA dummy batteries: where?

Thats a great idea. Thanks for posting.
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Old 10-01-2007, 11:39 AM #9
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Default Re: AAA dummy batteries: where?

Another idea I got from another forum:

"To make a stiff tube, you could take the shell of a ballpoint pen and run a wire inside it. The end of the wire would poke through the [flat] tail-end of the pen body to make the contact, and (before it was inserted into the pen) could be made into the right size contact by forming it into a flat spiral and then applying solder to give a flat disc on the end of the wire.

You could wrap the contact end of the pen with tape to make the end the right diameter for your tube to keep the contact centred, though many ballpoint pens are a similar diameter to AAA cells.

To keep the arrangement in the tube, and in contact with the spring, some wedges made of strips of cardboard, foam, etc could be placed in the tube at the open end of the tube, and you could also use use this arrangement to make the other contact - just have the stripped end of another piece of wire lying in the tube as you insert the wedges, and it would be pressed against the inside of the tube."


Note that a person says that wood can become conductive at high humidities
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Old 03-15-2012, 02:43 AM #10
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Default Re: AAA dummy batteries: where?

I am trying to make a dummy AAA by draining it and soldering the negative and positive ends together, but I'm stuck at draining the battery.

Is there any way to COMPLETELY drain an alkaline battery(Until it reads 0 volts across the negative and positive ends)??? I connected the positive and negative contacts with every piece of metal I have, but it keeps reading 1 volt on my multimeter! I thought it would short out and drain fairly quickly, wouldn't it?
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Old 03-15-2012, 03:01 AM #11
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Default Re: AAA dummy batteries: where?

Maaaaad necro, dude.
But since you dug it up, I'll answer with a possible solution.
Just get a nail, cut it to the length of an AAA battery, and wrap it in electrical tape but leave the top and bottom open for electrical conductivity.
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Old 03-15-2012, 03:04 AM #12
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Default Re: AAA dummy batteries: where?

Quote:
Originally Posted by Fretwrecker94 View Post
Maaaaad necro, dude.
But since you dug it up, I'll answer with a possible solution.
Just get a nail, cut it to the length of an AAA battery, and wrap it in electrical tape but leave the top and bottom open for electrical conductivity.
Figured it was better than getting spanked for making a duplicate thread :P

Do you mean wrap the nail until it's as thick as an AAA? that would need a lot of tape, wouldn't it?
I kinda need it to fit snug in my host; it's a tad too big for AAA's to begin with, so anything smaller would bounce around a lot.
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Old 03-15-2012, 04:38 AM #13
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Default Re: AAA dummy batteries: where?

Dummy battery AAA size x4 | eBay

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Old 03-15-2012, 01:57 PM #14
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Default Re: AAA dummy batteries: where?

Quote:
Originally Posted by kumowoon1025 View Post
I am trying to make a dummy AAA by draining it and soldering the negative and positive ends together, but I'm stuck at draining the battery.

Is there any way to COMPLETELY drain an alkaline battery(Until it reads 0 volts across the negative and positive ends)??? I connected the positive and negative contacts with every piece of metal I have, but it keeps reading 1 volt on my multimeter! I thought it would short out and drain fairly quickly, wouldn't it?
this thread is 5 years old...
You should get into the habit of reading the date of the
Last Post before posting...

That being said.... there are solutions in the original
Thread... as well as above.

You can also get a 3/8" bolt and cut it to a length of
1-3/4" (without the head of course).

Or a wooden dowel of the same dimensions covered
with aluminum foil..

Your Alkaline batter will never read 0 volts unless it
has a permanent short across it.


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Last edited by lasersbee; 03-15-2012 at 01:58 PM. Reason: Spelling errors
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Old 03-15-2012, 02:03 PM #15
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Default Re: AAA dummy batteries: where?

You were the guy suggesting me these more than a year ago

Works great for 532nm Newish pens in combo with the blue Trustfire 3.7

Quote:
Originally Posted by InfinitusEquitas View Post
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445nm >> Kryton Smooth by lazeerer peak@2075mW
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473nm >> Optotronics RPL-B peak@112mW
515nm >> Skylasers HL peak@41mW
532nm >> Novalasers Alpha HP peak@284mW
589nm >> CNI PGL-III-A peak@89mW
594nm >> Laserglow Rigel peak@4mW
635nm >> MXDL by DTR peak@38mW
642nm >> Saillaser peak@23mW
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Old 03-15-2012, 02:19 PM #16
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Default Re: AAA dummy batteries: where?

Quote:
Originally Posted by lasersbee View Post
this thread is 5 years old...
You should get into the habit of reading the date of the
Last Post before posting...
But isn't necro at least better than creating a new thread if it's a similar topic??

Or should I just create a new thread if the existing one is 5 years old?
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