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<DIV dir=ltr align=left><SPAN class=674562308-18092008><FONT face=Arial
size=2>Yes, I want to see this (your testing). I will also talk to my contacts
at TP and see why they are not recommending this pack. TP specifically told me
the 5200 pack (5s2p) is best for pattern.. but I wonder why. I'll find
out.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=674562308-18092008><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=674562308-18092008><FONT face=Arial
size=2>sc</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> nsrca-dist7-bounces@lists.nsrca.org
[mailto:nsrca-dist7-bounces@lists.nsrca.org] <B>On Behalf Of </B>James
Oddino<BR><B>Sent:</B> Wednesday, September 17, 2008 9:40 PM<BR><B>To:</B> CA,
AZ, HI, NV, UT<BR><B>Subject:</B> Re: [NSRCA-dist7] LiPo cell
configuration<BR></FONT><BR></DIV>
<DIV></DIV>TP does have a 10s1p 5000 V2. I borrowed one and flew a few
flights on it, but it was before I had the CellPro. It's performance was
very good but it did seem to have balance issues on the TP 1010/210. I'm
going to be out of it for the next two weeks but I'll try to test it again when
I get back. Perhaps the CellPro will keep it in better balance.
<DIV><BR></DIV>
<DIV>Jim</DIV>
<DIV><BR></DIV>
<DIV><BR>
<DIV>
<DIV>On Sep 17, 2008, at 9:04 PM, Scott wrote:</DIV><BR
class=Apple-interchange-newline>
<BLOCKQUOTE type="cite">
<DIV>
<DIV><SPAN class=279212203-18092008><FONT face=Arial size=2>Hey Electric
Guys,</FONT></SPAN></DIV>
<DIV><SPAN class=279212203-18092008><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=279212203-18092008><FONT face=Arial size=2>I'd be interested
in what LiPo battery configuration you are using.. 5S2P, 5S4P, 5S1P... other.
Why?.. read on. I believe the less "P" you have in the battery the easier to
balance and possibly the longer life you will get due to better cell balancing
before charging. I have recently converted to a new cell by TP, some of you
saw this at the Hollister contest. The 5S2P, 5200 pack, is working great. Jim
Oddino and I checked the internal cell resistance, which was around
3milli-ohms (if I recall correctly). This battery puts out 156A burst, the
older 5s4p, 5300 pack put out 109A burst. My thinking is this, the lower "P"
pack you have the easier to keep the battery in balance. If you have a 4p
pack, any one of the 4p cells can degrade over time, causing the 4p 'bank' to
not supply as much sustained current - causing the whole battery to be weaker.
Jim and I played with a Cellpro 10S charger, and I think we concluded that it
would be difficult for any charger to determine if any one cell in
a 4p bank was going bad (you can only monitor the bank IR, not the
individual cell within the bank). However, if you had a 1p 10S pack, you could
easily tell if the cell was gaining resistance as it aged. On a 2p pack, the
resistance CHANGE may not show up as easily as a 1p pack but much easier than
a 4p pack. We are trying to determine here when a 5S pack is getting weak
(yes, we can see as we fly - but if we could determine as it happens, perhaps
we can correct this by charging differently). Jim O mentions he has not seen a
battery with as low of internal resistance readings as the new TP pack, which
equates to more power, less heat in use, and I hope longer life. I will
mention here that my 5300, 5s4p packs have lasted 2-3 years and many,
many flights, but they are getting old.. and the new packs may last
3-4 years.. they are also around $250 each.. a reduction in price from the
5s4p packs. I believe even newer technology will soon show us a 10s1p
pack from TP - and some may have this now from other
manufacturers.</FONT></SPAN></DIV>
<DIV><SPAN class=279212203-18092008><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=279212203-18092008><FONT face=Arial size=2>I'd be interested
in your opinions on this topic.</FONT></SPAN></DIV>
<DIV><SPAN class=279212203-18092008><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=279212203-18092008><FONT face=Arial
size=2>Scott</FONT></SPAN></DIV>
<DIV><SPAN class=279212203-18092008><FONT face=Arial
size=2></FONT></SPAN> </DIV></DIV>_______________________________________________<BR>NSRCA-dist7
mailing list<BR><A
href="mailto:NSRCA-dist7@lists.nsrca.org">NSRCA-dist7@lists.nsrca.org</A><BR>http://lists.nsrca.org/mailman/listinfo/nsrca-dist7<BR></BLOCKQUOTE></DIV><BR></DIV></BODY></HTML>