[time-nuts] Lead acid battery noise levels

Brooke Clarke brooke at pacific.net
Thu Jul 11 12:05:36 EDT 2013


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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