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<body class='hmmessage'><div dir='ltr'>Ooops, I actual meant to send this e-mail to the group!<div><br></div><div>Mike C<br><br><div><hr id="stopSpelling">From: precisionaero@hotmail.com<br>To: vincebrc@gmail.com<br>Subject: RE: [NSRCA-discussion] Resistance and retirement<br>Date: Mon, 10 Nov 2014 18:07:30 -0700<br><br>
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<div dir="ltr">The issue I am having is with some packs I use for an EDF. Under the "load" of takeoff, two of the three packs I use noticeably sag. I took off after the sag the first time and was able to make it around for a landing, but I don't think I took a breath the whole time. I topped off the packs and ran them on the ground and could hear the sag then too. I did not hook up my watt meter in line because the watt meter has Deans connectors and the EDF has 5.5mm bullets. I did cycle both packs on the chargers and they had about 3 to 4 mOhm resistance on 5 of the 6 cells with one pack having a 6 mOhm resistance and the other 12.5 mOhm resistance on an individual cell. I guess I am surprised the higher resistance on one particular cell could cause a problem, but I know the EDF systems hit the batteries really hard. Any thoughts on why I am seeing an issue? Is it related to the higher resistance? Is there some device out there that tests individual cells under a discharge load?<div><br></div><div>Mike C <br><br><div><hr id="ecxstopSpelling">Date: Mon, 10 Nov 2014 11:02:18 -0600<br>To: chuenkan@comcast.net; nsrca-discussion@lists.nsrca.org<br>Subject: Re: [NSRCA-discussion] Resistance and retirement<br>From: nsrca-discussion@lists.nsrca.org<br><br><div dir="ltr">I use TP. The IR is usually around 2-3 when new. I usually use them for practice and contest until around IR gets around 5. Over 5 I start to feel the power loss and I don't use those anymore. I don't like to take the smoke risk. In general, I get around 80-100 cycles. <br></div><div class="ecxgmail_extra"><br clear="all"><div><div class="ecxgmail_signature">Vicente "Vince" Bortone</div></div>
<br><div class="ecxgmail_quote">On Mon, Nov 10, 2014 at 9:18 AM, Phil S. via NSRCA-discussion <span dir="ltr"><<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank">nsrca-discussion@lists.nsrca.org</a>></span> wrote:<br><blockquote class="ecxgmail_quote" style="border-left:1px #ccc solid;padding-left:1ex;"><u></u>
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<font face="Arial">Yes, Dan, these things work on the Smooke Principle
-- if you let the white smoke out, they quit working...</font><br>
<pre>Phil Spelt, KCRC Emeritus, Secretary
AMA 1294 Scientific Leader Member
SPA L-18, Board Member
(865)435-1476v, (865)604-0541c</pre><div><div class="h5">
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On 11/9/2014 5:47 PM, Dan Curtis via NSRCA-discussion wrote:
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<div><span>Ah, flag, that is where I was making my mistake. I
thought it was white smoke.</span></div>
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<div dir="ltr"> <font face="Arial"> On Sunday, November 9,
2014 4:42 PM, Ed White via NSRCA-discussion
<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank"><nsrca-discussion@lists.nsrca.org></a> wrote:<br>
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<div dir="ltr">I don't go by IR differences. I eventually reach a
point that in a practice flight I pull up for the last maneuver in the
sequence and the battery puts up a little white flag and says, "not
gonna happen". Then I retire the pack.<br clear="none">
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Ed<br clear="none">
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<div>On Sat, Nov 8, 2014 at 1:56 PM,
Michael Cohen via NSRCA-discussion <span dir="ltr"><<a href="mailto:nsrca-discussion@lists.nsrca.org" rel="nofollow" shape="rect" target="_blank">nsrca-discussion@lists.nsrca.org</a>></span>
wrote:<br clear="none">
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<div dir="ltr">Is there any rule of thumb for how much difference
between individual cell resistances is OK before a back should be
retired?
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<div>Regards,</div>
<div>Mike C</div>
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