[Chrysler300] [Fwd: Slow Death]

[Rich Barber <barber@xxxxxxxxx>]

Retransmitted as Yahoo did not like me using an underscore.  
Picky-picky, picky.
rb



Bob:

Thanks for a very thorough and well-stated response.  The knowledge base 
of this Club never ceases to amaze me.

Perhaps Tim's rule of thumb is really 1/2 % per day.  That is more in 
line with your data.

Rich Barber
Brentwood, CA
C-300

Bob Jasinski wrote:

>Tim,
>
>You mentioned, "The rule of thumb that was used was that a lead/acid battery
>looses half
>its remaining charge every 24 hours".
>
>I afraid I have to disagree with this.  Lead acid batteries do self
>discharge, but not nearly that fast.  Just to clarify what we are referring
>to, we are describing a battery that starts out fully charged, with no load,
>as if you charged it fully and disconnected it from the circuit to assure a
>no load condition.
>
>According to the Battery Council International (BCI) self discharge @ 80
>degrees F equals about .001 Specific Gravity (S.G.) per day. A typical wet
>car battery starts out full charge at 1.265 S.G., and is considered fully
>discharged at 1.120 S.G.  That would equate to a fully discharged state
>within 145 days.  That is about .69% per day discharge.
>
>The amount of self-discharge is much slower at lower temperatures, and
>higher with higher temperatures.  Also, the lower amount of antimony in the
>grid alloy the less amount of self discharge, that is why "low maintenance"
>and "sealed" batteries (which have little or no antimony) have a longer
>shelf life, but are less likely to accept a charge once they do go flat.
>
>I have worked for GNB, Exide and C&D battery companies over a 20 year period
>and have been involved in battery applications pertaining to UPS, Telecom,
>Motive Power and Automotive uses during that time.  My access to battery
>engineers and designers have allowed me an opportunity to develop a deeper
>understanding of what makes these black boxes "tick".
>
>Bob J
>Danville, CA
>




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