[NSRCA-discussion] batteries?

Fri Apr 17 08:14:10 AKDT 2009

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 W.Kennie <geobet4 at verizon.net>
> *To:* NSRCA Mailing List <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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