[TheForge] was solar cells OT: POL: chickens

[Grover.Richardson at gtri.gatech.edu]

Understood.  However all our testing was with rechargeable batteries.  Rechargable are popular with the green folks.

-----Original Message-----
From: theforge-bounces at mailman.qth.net [mailto:theforge-bounces at mailman.qth.net] On Behalf Of James Binnion
Sent: Thursday, March 17, 2011 12:32 PM
To: Blacksmithing List Sponsored by ABANA
Subject: Re: [TheForge] was solar cells OT: POL: chickens


On Mar 17, 2011, at 7:41 AM, <Grover.Richardson at gtri.gatech.edu> <Grover.Richardson at gtri.gatech.edu> wrote:

>  Oh yes, all of the batteries that I have tested so far (other than the lead acid) have sucked on being able to produce a high current pulse.  By sucking I mean they have a high internal resistance, which causes the battery to internally absorb as much power as it is putting into the load during peak current conditions.

You ought to try lithium thionyl chloride batteries, very high energy density and very low internal resistance and light weight. Only one tiny problem they are primary cells, not rechargeable. But man they put out a lot of energy. It is these properties that make lithium chemistry batteries so attractive but at least with the current examples once you set up lithium chemistry batteries to be rechargeable you loose the low internal resistance.

James Binnion
jbin at well.com



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