[NSRCA-discussion] [SPAM] Re: batteries?

Fri Apr 17 10:12:48 AKDT 2009

THIS IS JUST AN FYI  - NOBODY DO THIS !!

I am a guy who absentmindly placed his 1300mah 2S LIPO with the rx plug
missing into his pocket. It got real exciting when I noticed "SMOKE" coming
out of my pocket because the bare wires where the rx plug used to be had
made contact with each other. <VBsheepishG>

eddie

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Keith Hoard
Sent: Friday, April 17, 2009 11:14 AM
To: jpavlick at idseng.com; General pattern discussion
Subject: [SPAM] Re: [NSRCA-discussion] batteries?

I heard a story once about a guy who held a 5-call NiCd pack in his hand and
then snipped both wires simultaneously with a pair of dykes.  Ouchies. . .

On Fri, Apr 17, 2009 at 11:05 AM, John Pavlick <jpavlick at idseng.com> wrote:

Oh yeah. ALL batteries should  be considered somewhat dangerous. They ALL
have a lot of stored energy. When I used to race R/C cars we only had
NiCd's. One time when we were getting ready to head to the track for
practice, my friend noticed smoke coming from his racing box. When we opened
it up we saw that the wire supports for a rear wing had come in contact with
the connector on one of his 7-cell packs. The 1/16" wire was glowing red and
it had melted the Lexan wing. The wire actually fused (melted) and that took
care of the short circuit problem. The wing was ruined and  the battery was
HOT! I had a lot of respect for the amount of energy that one of those packs
could deliver after that. VBG

John Pavlick

--- On Fri, 4/17/09, James Oddino <joddino at socal.rr.com> wrote:

From: James Oddino <joddino at socal.rr.com>
Subject: Re: [NSRCA-discussion] batteries?
To: "General pattern discussion" <nsrca-discussion at lists.nsrca.org>
Date: Friday, April 17, 2009, 3:37 PM

I don't agree John.  Write a spec for your batteries.  When you get to the
user friendly section, state of charge is the most important parameter.  How
do you determine when it is charged (when to terminate charging) and how do
you know when it needs to be charged.  Safe fast charging is also a
desirable feature.  LiXX wins.  It is very difficult to determine the state
of charge of NiXX batteries.  You'd never specify a battery that you need to
overcharge to make sure it is charged and that is the case with NiXX.
Lithium also wins if you want small batteries.  If it is safety that you
alluding to, it is important to know what you are doing with any kind of
battery.  NiCds can deliver a lot of energy in a very short time too. 

Jim O

On Apr 17, 2009, at 6:52 AM, John Ferrell wrote:

I believe the market has confirmed your choice. The availability of NiCads
seems to be shrinking. The latest crop of NiMh (Eneloop, Sanyo) looks to me
like it will have own the entire market place soon. LiPo's still seem to be
the best power/weight ratio for those who need big batteries but remain less
user friendly.

John Ferrell  W8CCW

"All that is necessary for the triumph of evil is for good men to do
nothing." -- Edmund Burke
...."The problem with socialism is that you eventually run out of other
people's money."  
   MARGARET THATCHER 
http://DixieNC.US <http://dixienc.us/> 

----- Original Message -----

From: George <mailto:geobet4 at verizon.net>  W.Kennie

To: NSRCA Mailing List <mailto:nsrca-discussion at lists.nsrca.org> 

Sent: Thursday, April 16, 2009 3:12 PM

Subject: [NSRCA-discussion] batteries?

TOO COTTON-PICKIN' QUIET on here so I thought I'd stir the waters a little.

I remember, several times hearing on this forum that Nickel Metal Hydride
batteries were not all that desirable of a choice

when making the decision to make up a pak due to their tendency to
self-discharge and other erratic anomolies.

I feel compelled to relate my experience. I put a set of 2500 ma cells in my
Txmitter a little over a year ago.

When I take this unit off of charge, many times it has indicated a voltage
of 12 Volts (usually 11.9). My previous charge

was done last September and even though we are located in the N.E. where we
sometimes fly in temps ranging into

the low 20's, we do get out quite a few weekends throughout the winter.
Despite the fact that I never take my Txmitter

out of the car all winter long and it's subjected to 5 degree nites, which
I'm told is not good for batteries, I charged it

about a week and a half ago and since September it had finally dropped to
10.5 Volts.

Special Paks?, you ask?  I go to Best Buy and pick 'em up and solder up my
own. They're not significantly cheaper

than commercially available stuff I could buy, but when the impulse strikes,
I conveniently go and get 'em. Nice !

Since a week and a half ago I've only flown about 3 times, but the thing is
still reading 11.5 !

Now I do have to admit that they like a slow charge better than fast, but I
never slow charge the flight paks I wire up

for my planes and I don't own any planes with commercial flight paks and
some of them have more years on them than

I would dare to mention in this group.

Soooo, If you've been considering a NMH pak and you have doubts or concerns,
take my experience for what it's worth !?!

G.

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-- 

Keith Hoard
Collierville, TN
khoard at gmail.com

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