Frequency of batteries

It's the reciprical of how often you have to pay for sex. It can't be infinite, since the DC would have to been available at the Big Bang (sorry sex again), which is slightly longer than the availability of of manufactured batteries, ie 6000years

Martin

Philosophical issues of this type cannot be resolved. The Fourier transform for zero bandwidth requires that the condition has always existed and always will. Sounds like God to me.

For 'zero' change you need 'ideal' component. When you find such keep it for references. All others will have responses to changing conditions, easiest way to find is to introduce those changes and measure.

Been there, done it.

Stanislaw.

The more drain over time...the higher the frequency of battery changes. :P High frequency batteries are those cheapo dollar store zincs. You'll be changing those frequently :P

ok.. Maybe that wasn't very funny.. :)

Check out parasitic internal inductance of batteries.

D from BC

"blazingbadger" <

** The "frequency" of a battery is how " frequently " you change or recharge it.

Charging and discharging a battery is called " cycling ".

The life span of a rechargeable cell is determined by the number of "cycles" it can accept without deterioration

...... Phil

The concept is meaningless, so don't worry about it.

John

Is a 'blazing badger' anything like a 'flaming ferret'?

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Michael A. Terrell
Central Florida

Yeah, million yuks! I remember when me and my buds were smart-asses in High school asking the physics teacher if there was an AC battery. Huh, Huh, huh! (He had no idea, natch)

Not so. A battery has a frequency distribution not a single frequency! The waveform of which one takes a Fourier transform would be a sort of step up to the battery voltage (occurs when the battery was manufactured) followed by a slow decay to zero as the battery ages. These are pretty low frequencies but not anywhere near zero.

Yes this is true as well and often can cause problems (noise) in battery powered circuits. Since he voltage output of the battery comes from chemical effects of the atoms and larger particles making up the materials of the battery, the output voltage is not pure DC (or more exactly the pure decaying waveform we talked about above) but rather has relatively high frequency noise on it because of stochastic processes in the battery. However, the spectrum of this noise does NOT extend to infinity or even to high radio frequencies because a battery is a chemical device and chemical processes have certain speed limitations. This is the same effect that makes electrolytic capacitors poor filters at very high frequencies. The chemical actions simply can't follow the frequencies. So infinity is wrong as well.

The definition of frequency is OK, but really we are talking here about frequency distributions or essentially a frequency density.

So does this make sense yet?

The correct question would have been the one about the impedance vs frequency

Rene

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And that depends dramatrically on how you define "deterioration".

Perhaps it's a problem to use a 1.5V cell to power a microwave oscillator with no supply bypass capacitors.

D from BC

based on 5 yr battery life, fundemental would be aproximatly

0.00000004 hz

Colin =^.^=

It depends on the rise-time when you switch it on. ;-)

But seriously, "frequency" is just not applicable to batteries. They're "DC".

Of course a true DC signal would have had to have started before time began, and stay steady until the end of time, but for practical purposes, it's not worth bothering with other than as an intellectual exercise.

Hope This Helps! Rich

Car batteries, about once every five years or so. ;-)

Flashlight batteries, it depends on how much you use it.

NiMH, about 1/(a few days). >:-[ (I'll never waste my money on NiMH again!)

Cheers! Rich

What were you using them in? One area where NiMh do considerably worse than NiCds is in high-drain devices -- the internal resistance of NiMh is *much* higher than NiCds, so in high-drain devices their terminal voltages hits "end of battery life" much sooner. See, e.g.,

I'd guess that he had heard that lame joke for so many years that he couldn't even fake a grin, and didn't want to encourage the idiots.

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Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

The correct term is EIS, short for electronic impedance spectroscopy. In which all frequencies are dealt with.

Further the frequencies depend upon the Fourier spectrum of the duty cycle.

More on my website.

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not even wrong. There is no such thing as DC.

There is only the Fourier spectrum of the duty cycle, which may or may not include a zero frequency term.

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Many thanks,

Don Lancaster                          voice phone: (928)428-4073
Synergetics   3860 West First Street   Box 809 Thatcher, AZ 85552
rss: http://www.tinaja.com/whtnu.xml   email: don@tinaja.com

Please visit my GURU\'s LAIR web site at http://www.tinaja.com

It's a digital camera - Fuji "Finepix A210". So, I loaded it with good ol' alkalines, and after a while on the shelf, THEY went dead.

So, having already tossed 8 AA NiMHs, I still have to open the battery compartment when I'm not using it. And I have to reset the clock/calendar each time I use it.

But, was it the camera that killed the NiMHs? I have a "smart" charger, and always at least 4 AAs "charged", but even they got to the point where I'd take them out of the charger, put them in the camera, and they'd go dead, like in seconds.

Right now, the $2.00 set of AAs in it has lasted about 6 months, but I disconnect them when I'm not using the camers.

Thanks, Rich