Newsgroups: comp.robotics
Subject: Re: help...battery power
From: andrew.jenkins@pcohio.com (Andrew Jenkins)
Path: brunix!news.Brown.EDU!agate!howland.reston.ans.net!gatech!usenet.ins.cwru.edu!ncoast!pcohio!andrew.jenkins
Distribution: world
Message-ID: <24.4509.2500.0NB2D7F2@pcohio.com>
Date: Sat, 26 Feb 94 12:59:00 -0500
Organization: PC-OHIO PCBOARD - Cleveland, OH - 216-381-3320
Lines: 43

<<  HATTORI@CSRD.NKK.CO.JP to ALL   on    Re: help...battery power  >>

HH>The book I have says that assuming batteries has capacity of C
HH>(Amp-hours), Lead-acid batteries can provide maximum 2C Amps at a time
HH>where NiCd's maximum 10C.  If, for example, your DC motor consumes 2
HH>amps peek current, you need 1 amp-hour Lead-Acid battery for 30
HH>minuites long, or 200 milli-amp-hour NiCd batteries for 6 minuites
HH>long.

Try using a Gates 2.0V, 5.0 A-HR. X-cell lead-acid battery. My experience 
(and their specifications) tell me that one of these will deliver peak 
currents in excess of 40 Amps. We have used these batteries over and 
over for microgravity wire-flamability experiments to ignite Teflon 
and Kapton insulated wire (Space Shuttle fire safety) at the 2.2 
second drop tower at NASA's Lewis Research Center. That works out to 8C, 
if I'm not mistaken. Granted, it will last less than 3 minutes (V vs. C). 
Our tests last 2.2 seconds.
Frankly, I'm not sure about standard (Duracell, EverReady, etc.) batteries. 
One of these days I'll have to burn up a few to test your numbers. The 
lead-acid cell can be charged without ~complete charge depletion as well. 
And they last ~forever.
I've got nothing against NiCad, we just happen to have decided in
favor of lead-acid cells.

For more information write to:

Gates Energy Products
Industrial Battery Division
617 North Ridgeview Road
Warrensburg, Missouri 64093
U.S.A.

Ph: (816) 429-2165

Regards,




AJ

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