about 6F22

i was wasting some half a day to find out the max. safe discharge current rate for carbon zinc type
there was no such data avail.
-- so i had to make a best guess about

a fuzzy logic follows ::

it is statistical nonsense but since i had no other data avail than GP-s datasheet then what it seems / was assumed is that the average drain over longer time is somewhat constant . . .

. . . so if you want to design an application that uses 9V C-Zn battery then something optimal value is 12mA or below -- that is -- if it is to work 24/7

( it is amazing that we don't have that value available -- if you overload the battery it gonna heat up that first boosts the chemical reaction but likely roughly over 40°C (104°F) it starts to damage internal chemistry further on there might be acid or alkaline leak or explosion or even fire when Li-ion gets in contact with oxygen -- so all such totally insignificant stuff no one needs to know exactly -- especially the EE app. designers )

---

[Eop]

father (Darth Sidious ;p) asked a "Stupid Question"

as why the automotive cellphone charger finishes much quicker than the wall supply
heres what i came up with (though i'm not so shure about it)

Simplified Battery Charging

related formulas ::
(*) -- ! not proven !

E(J) = Q(A·h)·ε(V) ΔE = dt·P(W) ΔQ = I·t dQ(A·s) = dt(s)·I(A)	ε = a·rb = E/Q Δε = a·Δ(rb) = Δ(E/Q)	P = U²/r = I²·r α²Q - αE = 0 (Q/QMAX)² - (E/EMAX) = 0 (Q/QMAX)² = E/EMAX (*) Q² = Q²MAX/EMAX(=ϰ) ·E E/Q = Q/ϰ	ε = a·rb r = (ε/a)1/b
(E=)Q²/ϰ - Q·ε(=E) = 0 Q/ϰ - ε = 0	E = √(ϰ·E)'·ε √(E/ϰ)' - ε = 0 E = Q·ε ε = E/Q =  Q/ϰ	ε = u + U = i·r + U εTF = i·rTF + U ε℩B = i·r℩B + U	εTF - i·rTF = ε℩B - i·r℩B εTF - ε℩B = i·( i·rTF - i·r℩B) i = ΔεX/ΔrX

[EoP]

about AA or LR6

i used to believe that the battery capacity is not been near entirely used (by random application) so i  a bit "wasted my time" on studding 'em // -- as in fact it turns out the battery keeps it's output "Up" for up to 90% of it's capacity

the processes present at exploitation (not discussed further in this article - just listed)::

0) internal electro mechanics and electrical field set up by load current and env. temperature
1) reduction of the chemistry induced charge
2) chemistry change by discharge
3) re-inducing the charge by present chemistry

i made the series of simple discharge v. time tests
the values for internal resistance and electro-motoric force are derived theoretically⁽¹⁾

notice! that the experiment recorded just terminal voltage and current levels -- everything else is derived

the legend explained::

C836mAh(%) -- the percentage of "full capacity" -- 836mAh in this case
iC -- 1 (100%) minus C836mAh(%)
E -- electro-motoric force in volts
r20Ω(%) -- internal resistance / 20Ω
Iest(A) -- estimated terminal current in amperes
P(W) --U x I -- external- / diffusing power
Csimple(%) -- R.const C battery alternate (as using capacitor + delimiting resistor inplace of an alkaline)

about the error of the used theoretical model⁽¹⁾

i speculate that the master fluctuations are due error in device redings -- whatever the case it's not so significant

the E(r) or r(E) dependency⁽¹⁾ is defined from measuring multiple AA cells at their various discharge levels

notice! that there's no time dependency defined

[EOF]