Li-Ion packs

[Bill Lairsey]

Guys... The info I received from the Duralite Plus folks is that it is OK to 
take the pack as low as 7.1 volts under a one amp test load... so far I like 
mine too... I have a set from Bern and from Dualite Plus. I saved 9oz, over 
a typical nicad set up, on my 33% Edge 540T by using a 4000ma pack on the 
RX/servos and a 2000 on the ingition. In my installation I have 4 digital 
8411's and the remainder non-digital... I can get 6, 12min flights before 
getting to the 7.1 volt limit... Bill Lairsey, Portland, ME, IMAC Chapter 82 
Rep.


>From: Rcmaster199 at aol.com
>Reply-To: discussion at nsrca.org
>To: discussion at nsrca.org
>Subject: Re: Li-Ion packs
>Date: Sun, 8 Sep 2002 20:58:57 EDT
>
>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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