<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>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</DIV>
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<DIV>John <SPAN>Pavlick</SPAN><BR><BR>--- On <B>Fri, 4/17/09, James Oddino <I><joddino@socal.rr.com></I></B> wrote:<BR></DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid">From: James Oddino <joddino@socal.rr.com><BR>Subject: Re: [NSRCA-discussion] batteries?<BR>To: "General pattern discussion" <nsrca-discussion@lists.nsrca.org><BR>Date: Friday, April 17, 2009, 3:37 PM<BR><BR>
<DIV id=yiv1791391726>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.
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<DIV>Jim O</DIV>
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<DIV>On Apr 17, 2009, at 6:52 AM, John Ferrell wrote:</DIV><BR class=Apple-interchange-newline>
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<DIV><FONT face=Arial size=2>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.</FONT></DIV>
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<DIV>John Ferrell W8CCW</DIV>
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<DIV>"All that is necessary for the triumph of evil is for good men to do nothing." -- Edmund Burke<BR>...."The problem with socialism is that you eventually run out of other people's money." <SPAN class=Apple-converted-space> </SPAN><BR> MARGARET THATCHER<SPAN class=Apple-converted-space> </SPAN><BR><A href="http://dixienc.us/" target=_blank rel=nofollow>http://DixieNC.US</A></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message -----</DIV>
<DIV style="FONT: 10pt arial; BACKGROUND-COLOR: rgb(228,228,228)"><B>From:</B><SPAN class=Apple-converted-space> </SPAN><A title=geobet4@verizon.net href="mailto:geobet4@verizon.net" target=_blank rel=nofollow>George W.Kennie</A></DIV>
<DIV style="FONT: 10pt arial"><B>To:</B><SPAN class=Apple-converted-space> </SPAN><A title=nsrca-discussion@lists.nsrca.org href="mailto:nsrca-discussion@lists.nsrca.org" target=_blank rel=nofollow>NSRCA Mailing List</A></DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B><SPAN class=Apple-converted-space> </SPAN>Thursday, April 16, 2009 3:12 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B><SPAN class=Apple-converted-space> </SPAN>[NSRCA-discussion] batteries?</DIV>
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<DIV><FONT face=Arial size=4>TOO COTTON-PICKIN' QUIET on here so I thought I'd stir the waters a little.</FONT></DIV>
<DIV><FONT face=Arial size=4></FONT> </DIV>
<DIV><FONT face=Arial size=4>I remember, several times hearing on this forum that Nickel Metal Hydride batteries were not all that desirable of a choice</FONT></DIV>
<DIV><FONT face=Arial size=4>when making the decision to make up a pak due to their tendency to self-discharge and other erratic anomolies.</FONT></DIV>
<DIV><FONT face=Arial size=4></FONT> </DIV>
<DIV><FONT face=Arial size=4>I feel compelled to relate my experience. I put a set of 2500 ma cells in my Txmitter a little over a year ago.</FONT></DIV>
<DIV><FONT face=Arial size=4></FONT> </DIV>
<DIV><FONT face=Arial size=4>When I take this unit off of charge, many times it has indicated a voltage of 12 Volts (usually 11.9). My previous charge</FONT></DIV>
<DIV><FONT face=Arial size=4>was done last September and even though we are located in the N.E. where we sometimes fly in temps ranging into</FONT></DIV>
<DIV><FONT face=Arial size=4>the low 20's, we do get out quite a few weekends throughout the winter. Despite the fact that I never take my Txmitter</FONT></DIV>
<DIV><FONT face=Arial size=4>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</FONT></DIV>
<DIV><FONT face=Arial size=4>about a week and a half ago and since September it had finally dropped to 10.5 Volts.</FONT></DIV>
<DIV><FONT face=Arial size=4></FONT> </DIV>
<DIV><FONT face=Arial size=4>Special Paks?, you ask? I go to Best Buy and pick 'em up and solder up my own. They're not significantly cheaper</FONT></DIV>
<DIV><FONT face=Arial size=4>than commercially available stuff I could buy, but when the impulse strikes, I conveniently go and get 'em. Nice !</FONT></DIV>
<DIV><FONT face=Arial size=4></FONT> </DIV>
<DIV><FONT face=Arial size=4>Since a week and a half ago I've only flown about 3 times, but the thing is still reading 11.5 !</FONT></DIV>
<DIV><FONT face=Arial size=4></FONT> </DIV>
<DIV><FONT face=Arial size=4>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</FONT></DIV>
<DIV><FONT face=Arial size=4>for my planes and I don't own any planes with commercial flight paks and some of them have more years on them than</FONT></DIV>
<DIV><FONT face=Arial size=4>I would dare to mention in this group.</FONT></DIV>
<DIV><FONT face=Arial size=4></FONT> </DIV>
<DIV><FONT face=Arial size=4>Soooo, If you've been considering a NMH pak and you have doubts or concerns, take my experience for what it's worth !?!</FONT></DIV>
<DIV><FONT face=Arial size=4></FONT> </DIV>
<DIV><FONT face=Arial size=4>G.</FONT></DIV><BR>
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