Hi:
When Mercury in batteries was banned there was a scramble to eliminate it from
Alkaline batteries.
Many of the patents you see on a package of Alkaline batteries relate to
eliminating Mercury.
When the No. 6 dry cell was common the way they were tested was by using a pocket Amp meter to measure what later was
called "Flash Amps".
http://www.prc68.com/I/No6.shtml#Pat
Modern Alkaline batteries (actually pretty much all modern batteries) have very low internal resistance, so I would
expect them to also have low kTBR type noise.
An indication of the low resistance is the "Flash Amps" current.
http://www.prc68.com/I/No6.shtml#FA
Here's a table of Flash Amps (and a calculation of internal resistance) for
modern batteries (42 milli Ohms):
http://www.prc68.com/I/No6.shtml#MFA
Typically rechargeable batteries have lower internal resistance than primary batteries, but it might be interesting to
measure some of today's primary batteries, like the new "10 year" Alkaline cells that have come out in early 2013 or
late 2012.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
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