Charging concerns/questions with NMP Lithium Ion batteries

[Wayne Galligan]

I am with you on this one Mike.  Not enough  difference to make a hoot let
alone the extra cost.

Now if your flying electric... that's a different story.  LiPo's have a
definite advantage in that department.  I am sure the work that Jason S. is
doing with electric's will provide us with important information on the
efficiency, hazards and cost of these new technologies. I'm sure the LiPo's
will be outdated by newer technology by the time most of us will even
concider using them.
Kinda like my 386 computer was the day I bought it.

Wayne Galligan

----- Original Message ----- 
From: "Mike Hester" <kerlock at comcast.net>
To: <discussion at nsrca.org>
Sent: Friday, May 07, 2004 5:39 PM
Subject: Re: Charging concerns/questions with NMP Lithium Ion batteries


> Amen to that, Ed.
>
> And Cameron, the word is out there. Unlike 2 years ago, people now know
(at
> least on this list) of the POTENTIAL hazards lithium batteries can cause.
> That is all that can be done from our perspective, and perhaps all that
> needs to be done. Anyone that knows the risks and uses these batteries
> should at least take some precautions, and that's all you can really do.
>
> I choose to not use them, because personally the risks outweigh the
> benefits. Let's take a 2 cell, L-Ion receiver pack. It weighs about 2.5
> ounces. You need a regulator, so now we're at about 3 ounces or
thereabouts.
> if you use a 4 cell duralite plus, it actually weighs MORE than a 2000 mah
> NiMH pack.
>
> A NiMH 2000 mah pack weighs 4.7 ounces and has roughly the same power.
There
> are differences of course, but ROUGHLY it's the same power. Maybe you can
> get 10 flights opposed to 9 with a NiMH? Whoopity doo.
>
> So, for all of the hassle, the risk, we save a whopping 1.7 ounces. Bro I
> can sand that difference off my plane.
>
> Super duper intellicharge 2000 or wth-ever, it just isn't worth it to me
for
> 1.7 ounces. And usually I run a SR 1100, which weighs 3.8 ounces, so now
> we're only talking less than an ounce, but slightly more power. I think
I'll
> just charge more often and be happy about it.
>
> -Mike
> P.S. Troy aren't you sponsored by Central Hobbies? Just curious, not like
it
> matters =)
>
> ----- Original Message ----- 
> From: "Ed Miller" <edbon85 at optonline.net>
> To: <discussion at nsrca.org>
> Sent: Friday, May 07, 2004 6:08 PM
> Subject: Re: Charging concerns/questions with NMP Lithium Ion batteries
>
>
> > Ok, what built in "safety devices" does the dedicated charger have to
> ensure
> > that, in the event it has a component failure, it does not overcharge
the
> > Lithium batteries ?? What built in safety device can I build into an
> > airframe to ensure that  normal day to day flight rigors does not in any
> way
> > compromise the integrity of the Lithium cell to the point it could vent
?.
> > All current battery technology can cause a fire if certain circumstances
> are
> > present or created, it just seems to me the intensity of a lithium cell
> fire
> > far exceeds what we as modelers can normally safe guard for. My family
and
> > home are worth far too much to risk losing so that I can play model
> > airplanes. I use nicads and NimH batteries, never charge overnight while
> we
> > sleep, charging only when I am present in the shop or in the car on the
> way
> > to the field. You need to see a home with all it's possessions, memories
> and
> > history burn to it's foundation to truly understand the devastation fire
> > causes. Material loss is a distant second to the emotional loss suffered
> by
> > a family dealing with a fire tragedy.
> > Ed M.
>
>
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>


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