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<DIV><SPAN class=286141215-27022006><FONT face=Arial color=#0000ff
size=2>Aha!</FONT></SPAN></DIV>
<DIV><SPAN class=286141215-27022006><FONT face=Arial color=#0000ff size=2>Hi
Ed,</FONT></SPAN></DIV>
<DIV><SPAN class=286141215-27022006><FONT face=Arial color=#0000ff size=2>The
"good" low resistance NiMh cells don't need a couple of conditioning cycles
to come to full capacity. I confirmed this with both Larry at SR Batteries,
<EM>and</EM> with Steve at NoBS Batteries.</FONT></SPAN></DIV>
<DIV><SPAN class=286141215-27022006><FONT face=Arial color=#0000ff size=2>Both
sets of 900H cells that I bought several months ago, checked within
1% of their best capacity after the first cycle. I was told that is normal, and
to still stick to a max C/2 fast charge.</FONT></SPAN></DIV>
<DIV><SPAN class=286141215-27022006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=286141215-27022006><FONT face=Arial color=#0000ff
size=2>Dean</FONT></SPAN></DIV>
<DIV> </DIV>
<P><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT
face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT
face="Times New Roman">Kodeos Communications</FONT> <BR><FONT
face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT
face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT
face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT
face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT
face="Times New Roman">d.pappas@kodeos.com</FONT> </P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>Ed
Alt<BR><B>Sent:</B> Monday, February 27, 2006 6:40 AM<BR><B>To:</B> NSRCA
Mailing List<BR><B>Subject:</B> Re: [NSRCA-discussion] NiMH follow
up<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>Ed:</FONT></DIV>
<DIV><FONT face=Arial size=2>Yep, 1/10C would be 220 mA for your 2200 mAh
pack. To condition a NiMh pack when brand new, you do several
conditioning charges at 1/10C. You want to go a full 24 hours at 1/10C,
do a discharge to complete a cycle and repeat for a total of 3 or 4 full
cycles. This will generally get you to full capacity and also gets
the cells ready to accept higher rate charging and with the right charger,
they will then start to give a reliable indication of when they have
peaked. After these first conditioning charges, you do not want to
exceed about 16 hrs at 1/10C, though at 1/10C it's a low enough rate that
you're not going to damage it if you do go over. Anything higher
than 1/10C can shorten the life of the cells if repeated overcharging is
done. The higher the rate and the more time it is overcharged, the
faster the degradation can occur.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ed</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=divesplat@yahoo.com href="mailto:divesplat@yahoo.com">Ed Deaver</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, February 27, 2006 12:57
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] NiMH
follow up</DIV>
<DIV><BR></DIV>
<DIV>OK, for us non-electical whiz bang guys, please explain the C
charge. I have heard it before and tried what was suggested on RCU
without success.</DIV>
<DIV> </DIV>
<DIV>My new NmHD pack is a 2200mah, 4 cell pack. To condiditon it
properly for first flights what should I do? </DIV>
<DIV> </DIV>
<DIV>Does 1/10 C mean charge at 220 mah for 16 hrs??</DIV>
<DIV> </DIV>
<DIV>THanx for the explanation.</DIV>
<DIV> </DIV>
<DIV>ed<BR><BR><B><I>Michael Cohen <precisionaero@comcast.net></I></B>
wrote:</DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Thanks
to those who helped me with the advice. The 1/10 C change was the
<BR>answer. Both packs are happily at 1610-1690 capacity for their 1650
rating. <BR>I also visited an old friend's website, Electrodynamics in
Michigan. They <BR>had an interesting write up on their website about NiCD
(with a little NiMH <BR>sprinkled in! ). I used to buy all my switches,
extensions, and battery packs <BR>from them when I lived in the Great
White North. Their advice was 1/10 C <BR>also, but they had lots of other
good info there as well. I recommend you <BR>take a look, unless your one
of those Lithium people.<BR><BR>Mike Cohen
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