DPRG mailing list archives: [DPRG] Re: 9 volt batteries in parallel

Tue Mar 27 10:40:43 CDT 2007

Chuck,

You are correct - 9V batteries are short on current capacity, which is
precisely why I need to use them. There's more to the story. The circuit
I'm building has to be mounted in an intrinsically safe area, so I have
to limit the total power capacity of the batteries.

Rick

________________________________

From: dprglist-bounces at dprg.org [mailto:dprglist-bounces at dprg.org] On
Behalf Of Chuck McManis
Sent: Monday, March 26, 2007 3:56 PM
To: dprglist at dprg.org
Subject: [DPRG] Re: 9 volt batteries in parallel

Given the energy density of 9V batteries and their internal resistance,
ganging them up in parallel is generally a waste of time (by which I
mean a different solution will solve your problem within design
requirements) 

8 x Sub-C NMh batteries can give you 9.6v at up to 35 amps in a package
that is comparable in size volumetrically to about 6 or so 9V batteries
in parallel. 

3x Lithium (9v nearly exactly) will give you better current than
alkaline 9v (and even NiCd 9v) with less volume than 3 9V batteries in
parallel. 

--Chuck

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