Re: Optima batteries - acceptable temperature range

["Thomas Shay" <tshay@ix.netcom.com>]

Can anyone understand and explain what may happen when
the several batteries in a set are at different temperatures?
This happens because some in a set are surrounded by other
batteries which helps keep them warm.  Also some have
more air circulation  around them than others.  I've wondered if
this isn't part of the cause of problems Sparrow owners have with
their Optimas.

Tom Shay


----- Original Message -----
From: <ethorpe@gric.com>
To: <ev@listproc.sjsu.edu>
Sent: Monday, October 21, 2002 9:59 AM
Subject: Optima batteries - acceptable temperature range


> Just reviewing the battery temperature range for Optimas, because if too
hot
> they vent (lose moisture) and too cold they cannot deliver full capacity.
>
> According to specs:
> BCI is based on 80 degrees F (26.7 degrees C)
> BCI = 120 minute at 25a discharge,to 10.5v cut-off
>
> Victor's controls try to keep batteries no less than 20 degree C (= 68.0
> degree F)
>
> For charging:
> Series String base on <125 degrees F (51.7 degrees C)
> Series String = 14.7v (max individual voltage < 15.6v)
>
> What is the percentage performance with batteries get cold?
> How about the (apparent) increase in performance when batteries get warm?
>
> Trying to do some planning for the coming cold weather.
>
> BR,
> Ed Thorpe
> Sparrow getting a replacement pack
>
>