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Value of capacitor in battery pack??

W

watersteps

New member
Anyone have an idea of the value of the capacitor (if it is a capacitor) that is in the front of the Safari AA battery pack, and why is it there?
You can unsnap the long battery cover and see the capacitor.
I know the batteries are 1.5 volt X 8 = 12 volts but, what purpose does the capacitor serve?
I'm building a belt mounted battery pack that uses an empty AA battery pack as a plug in device.
A coil wire will go from the dummy pack to a belt mounted battery pack.
This will remove a little weight from my arm when swinging the coil, plus there will be no stupid acid leaks to mess up the detector.

Thanks for any info you may have.
 
know if that information was available for the public, but if he finds out he will contact me.
 
Thanks JW, it is just a small capacitor you would think that someone could test one that is in an AA pack and find the value. I wish I knew how to test one for it's value.
 
I found some numbers on the capicator that I did not see before.

B
R135
9225S

Can anyone tell me what the value is with these numbers?
 
What you probably have found is a thermocouple that would be for overheating purposes. Hope that helps.
 
With those markings you may not have a capacitor there, capacitors will usually have a first possibly a second significant identifier, followed by a third multiplier number. Most capacitors will have a uF stamp (micro farrad) after a numeric number, an alpha character will at times follow the numeric to establish the tolerance. Color of the component can also play a factor in identification in discreet electrical components.

I suspect what you are seeing is some type of circuit protection or voltage regulation device for use as a primary or secondary backup from what the main circuit in the box has. I this case you could be seeing a varistor, themistor, thyristor, or some other crazy type stor. Depending on where the components are manufactured or purchased the markings on all electronics can be varied the standards seem to be kind of loose.

My other thought is that the component may be part of the circuit which signals the detector in reference to the power left in the battery pack or triggers the "flat battery pack" message by when it reaches a specific value. It will also depend on if the component is wired in series or parallel to the circuit.

If it is a capacitor and the markings can not tell the value, there are several multi-function meters that can test for value. The down side is that you will have to isolate the component by desoldering or cutting it out so that you can measure it.

Sorry I could not answer your question directly, and probably brought up many more. You might try visiting a "Batteries Plus" store where they can build custom battery packs to see if they can explain what type and purpose that component would have.


Good Hunting!
Q
 
Hey thanks guys for the help.
I did match the item with several ceramic capacitors on line. I even matched it to several at Radio Shack, but they did not have the same value.
I also found a capacitor value calculator on line, just plug in the numbers and it tells you the value. Using the numbers on my capacitor I find a value of 1.3 uF. The only trouble is trying to find the 1.3 uF capacitors.
So if anyone has a couple capacitors with a 135, 145, or 155 printed on them I would like to buy some.
 
Mystery solved, the capacitor is really a fuse, it is a PTC resettable 1.35A hold fuse. Trips at 2.7A max current.
The information was found on line and with help from some electronic experts.
So I can now build my external battery supply. Thanks to all who helped.
Some have ask me why I was building this external battery supply,
2 reasons. 1, try to reduce the weight of the detector I want to swing several hours a day. 2, find a better 12 volt supply that can be belt mounted and eliminate the need to purchase a bunch of AA batteries. I will post pics as I finish the project.
 
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