Li-Ion packs

[Rcmaster199 at aol.com]

In a message dated 9/6/2002 3:00:54 PM Eastern Daylight Time, jbudd at QNET.COM 
writes:


> Subj:RE: Li-Ion packs 
> Date:9/6/2002 3:00:54 PM Eastern Daylight Time
> From:<A HREF="mailto:jbudd at QNET.COM">jbudd at QNET.COM</A>
> Reply-to:<A HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
> To:<A HREF="mailto:discussion at nsrca.org">discussion at nsrca.org</A>
> Sent from the Internet 
> 
> 
> 
> >Thanks Jim.
> >
> >Ive been curious what a discharge curve looks like for
> >these batteries, anyone seen one?
> 
> My experience is that it's pretty constant (but not level), similar 
> to a lead-acid battery (which makes it very predictable).  As far as 
> I can tell (and I've run my Li-ion packs from Bern Furgang at 
> http://www.superbatterypacks.com down to slightly less than 6.6v) it 
> stays pretty linear with no discernable change in slope.
> 
> I eMailed Bern about this and he replied with, "I would not go below 
> the 6V threshold as you could loose the pack.  7.2V is a very safe 
> low end.  If you are at 6.6V you are OK."
> 
> Before I purchased the Li-ion pack/charger I consulted with Jim 
> Oddino as he had some experience with them.  He indicated that he was 
> favorably impressed.  I purchased the bx & charger in late June, and 
> at this point, I am too.
> 
> Jerry
> 
> -- 
> ___________
> Jerry Budd
> mailto:jbudd at qnet.com


At our club contest this weekend, I heard some very disturbing news regarding 
one manufacturer's present design Li-ion batteries. According to the source, 
the internal charge/voltage regulation circuitry, fails by shorting out. The 
ensuing heat from the short has caused a fire and some lost equipment. 

I would advise extreme caution with SOME of these battery systems. 

Matt Kebabjian
D3 VP
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