[NSRCA-discussion] batteries?

[Bob Kane]

The NiMH technology seems to be improving, both my TX batteries and the flight pack in my Temptation had a significant charge left after sitting unused since the fall.  The older NiMH cells would self discharge rather quickly.

 Bob Kane
getterflash at yahoo.com




________________________________
From: George W.Kennie <geobet4 at verizon.net>
To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
Sent: Thursday, April 16, 2009 3:12:26 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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