🚀 go-pugleaf

In article <1992Dec15.161824.7507@cc.gatech.edu> byron@cc.gatech.edu (Byron A Jeff) writes:
>
>I don't think that's the version referred to. RS has a line of high capacity
>NiCads (from memory of the 1993 catalog):
>
>Size:     Amp Hours
>-----     ---------
>D         4.3
>C         2.0
>AA        1.6 (I think) 

For what it's worth, here are the capacities of Ever Ready NiCad batteries in
my Oct 1992 - Mar 1993 Farnell catalogue (Farnell being a mail order firm, not
a producer):

Size	Amp Hours
----	---------
AAA	0.18
N	0.15
AA	0.50
C	2.20
D	4.00
PP3	0.11
PP9	1.20

RS, which in this country stands for Radio Spares, sell special high capacity
batteries made by Varta.  Most are odd sizes, but there is an AA battery with
a figure of 0.70 Ah.  Note that unlike what some people have claimed, those
PP3 and PP9 batteries put out 8.4V, not just 7.2V.

If that figure of 1.6 Ah for an AA battery is correct, I want an address so I
can order some!

As for the person who wanted to detect how full a battery is by the voltage it
produces, the Farnell catalogue has a graph showing capacity versus voltage.
The graph starts out at 1.4V, drops sharply to about 1.25V at 10% discharge,
stays fairly flat with a slight downward slope to about 1.2V at 75% discharge,
and then drops more sharply again.  In fact, there are three curves shown, for
different currents - using a higher current results in a slightly lower
capacity.  All three curves are the same shape, though - sharp drop, very
flat for most of the battery's discharge time, then another sharpish drop at
the end.  So you should be able to tell when a battery is really freshly
charged, and when it is really low, but you will have a hard time telling
whether it is 30% discharged or 60% discharged.

-- 
 "Keyboard?  How quaint!" - M. Scott

 Adrian Hurt			     |	JANET:  adrian@uk.ac.hw.cee
 UUCP: ..!uknet!cee.hw.ac.uk!adrian  |  ARPA:  adrian@cee.hw.ac.uk