Battery in terms of Microfarad {I heard they're like caps

[petemoore]

  I'll go out and get the 10,000 or so uF kirkpacitor [>4700uf @@rate, tomorroy.
  Just pre-finished an LM3875TF amp, and this question just kind of popped in.

[cpm]

kirkpacitor

whassthat?

[Morocotopo]

Tomorroy never knows.

[R.G.]

Batteries are like many-FARAD capacitors in terms of supplying current and running down over time. They do have an internal resistance that may be larger than the ESR of a real capacitor, and that has to be taken into account. This is why a battery is often "bypassed" by a real capacitor - it's to lower the effective ESR.

[PRR]

http://www.powerstream.com/9V-Alkaline-tests.htm
http://www.powerstream.com/z/9v-100ma-discharge-tests.png

R-C assumption:
Carbon-Zinc 9V battery with 100mA load discharges to 37% (3.33V) in 2520 sec.
Average voltage is 5.67V. At 100mA that is average 57 ohms.
2,520 second time-constant at 57 ohms is 44 Farads.
The data I have is for constant-current, we should use constant resistance loading.

Slew-Rate assumption:
0.025AH 0.25H (after initial bump, which may be where we would want to use a "capacitor")
100mA makes voltage drop from 5V to 4V in 900 seconds. Slew Rate in units Volts/Second is I/C.
This battery does not like 100mA load, it sags bad with bumps.
1V/900Sec=0.1A/C is 90 Farads

I will not attempt to explain the 2:1 discrepancy.

[R.G.]

2,520 second time-constant at 57 ohms is 44 Farads.
The data I have is for constant-current, we should use constant resistance loading.

1V/900Sec=0.1A/C is 90 Farads

I will not attempt to explain the 2:1 discrepancy.

We were taught to explain electronic phenomena in terms of Maxwell's Demon, the electrical spirit that lives in all electromagnetic operations.

In this case it's easy. Poking Maxwell's Demon harder makes him mad, and obstinate. Teasing him draws him out. It's simple, right? 

[FiveseveN]

Poking Maxwell's Demon harder makes him mad, and obstinate.

You know the drill: the empiricist says the methodology of interpretation/prediction is wrong. The theoretician says the experimental data is wrong/imprecise.