Re: (ET) Deep Cycle Battery Question

[Klein Robert W NPRI <KleinRW Npt NUWC Navy Mil>]

Does anyone think it might be of value to ascertain the condition/health 
of the battery, to but a good load on it and see how long it takes to 
drain it down to say 11.5 volts?

Bob Klein


-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu [mailto:elec-trak-bounces 
cosmos phy tufts edu] On Behalf Of David Roden
Sent: Wednesday, June 28, 2006 12:37 PM
To: elec-trak cosmos phy tufts edu
Subject: Re: (ET) Deep Cycle Battery Question


On 26 Jun 2006 at 11:51, Klein Robert W NPRI wrote:

> I've had the battery off charge now for a couple of days
> and when I put my ear close to the battery I clearly hear the 
> bubbling.

I've had batteries that, days or weeks off charge, still seemed to be 
gassing a bit.  There's no internal mechanism I know of that will cause 
disassociation of hydrogen and oxygen without external input, so I think 
that this is gas trapped as bubbles in the separators that gradually works 
its way out.  

Come to that, it seems as if it might have been more prevalent in the 
older 
batteries suffering from positive grid corrosion and mossing, but I'm not 
sure about that.


David Roden - Akron, Ohio, USA

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