Re: Optima batteries - acceptable temperature range

[Victor Tikhonov <vtikhono@lsil.com>]

Ed,

Never tested it, but performance at 30'C is good enough, so raising
temp will not improve it as much as would shorten the pack life.

I read somewhere that 25...30'C range is "best" balance between
performance and capacity. I took a word for it. Definition of
"best" is also arbitrary. Well, So far, so good.

Some of my Optimas now seem to have reversed cells for totally 
unrelated reasons, but the good ones I have no complains about.

Victor

ethorpe@gric.com wrote:
> 
> Thanks for the correction Victor.
> So, your standard operating temp is 30'C. What would you consider a high
> side limit? When might a YT experience thermal runaway? 40'C? 50'C?
> 
> -Ed T
> 
> -----Original Message-----
> From: Victor Tikhonov [mailto:vtikhono@lsil.com]
> Sent: Monday, October 21, 2002 1:23 PM
> To: ev@listproc.sjsu.edu
> Subject: Re: Optima batteries - acceptable temperature range
> 
> ethorpe@gric.com wrote:
> >
> > 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)
> 
> Ed,
> 
> If you're talking about me, my pack is kept at 30'C (86'F).