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<DIV><FONT face=Arial size=2>You have to compensate for losses. Very few things
electrical work at better than 80% efficiency and most are better than 50%. 17
hours seems to be a popular guess. 10 hours will not do it, 17 will always fill
it up if it will fill up based on most people's experience. </FONT></DIV>
<DIV> </DIV>
<DIV>John Ferrell <BR><A
href="http://DixieNC.US">http://DixieNC.US</A><BR></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=geobet@gis.net href="mailto:geobet@gis.net">George Kennie</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> Tuesday, February 28, 2006 10:29
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] NiMH
follow up</DIV>
<DIV><BR></DIV>Hi John, <BR>Thanks for the kind words, but I have the same
struggles grasping some of this stuff as anybody else (probably quite a bit
more). Take this battery stuff. I can't understand why it is that if I take my
500 ma pak and connect it to my 50 ma wall charger for 10 hours it isn't fully
charged????? Why is it necessary to charge it for 16 hours and try to
stuff 800 ma into that little package (hmmm,......maybe that's why those lipos
swell up that way??? BG ). I'm aware that when I fast charge my Tx pak, if I
can get it off the charger about 3-5 minutes before that buggar reaches peak,
the voltage will read 12 volts, but if I leave it on past peak the voltage
will be depressed to 11.4 or even 11.2. So why the heck would we want to
charge for 16 hours when the max voltage probably occurs somewhere around 10
hours?????????(I'm guessing). <BR>You and Ed have a really good handle on this
stuff, but I don't !!!! <BR>Georgie <BR>
<P>John Pavlick wrote:
<BLOCKQUOTE TYPE="CITE"> <SPAN class=070420601-28022006><FONT
face=Arial><FONT color=#0000ff><FONT
size=-1>Jay,</FONT></FONT></FONT></SPAN><SPAN class=070420601-28022006><FONT
face=Arial><FONT color=#0000ff><FONT size=-1> Yeah, I guess I forgot to
point that out. The time applies to a fully discharged pack (.9 ~ 1V
per cell). At C/10 it's pretty hard to hurt anything by "overcharging" i.e.
charge a partially discharged pack for 16 hours. At the higher rates it
becomes a very real possibility. Normally for "Fast" charging you'd use a
good Peak detect charger: 0 delta V or negative delta V depending on
the cell chemistry. For C/10 you can get away with a low cost constant
current charger - but you do need to shut it off! Ed also pointed out that
new packs generally need a full 20 hours on the charger at C/10. I would
agree that this is a good thing to do, but do remember to stop charging them
at 20 hours. It's easy to forget. Better yet use a timer, but if you go this
route, make sure that the charger won't turn into a "discharger" when the
input power is removed.</FONT></FONT></FONT></SPAN><SPAN
class=070420601-28022006>
<P><FONT face=Arial><FONT color=#0000ff><FONT size=-1>John
Pavlick</FONT></FONT></FONT> <BR><FONT face=Arial><FONT color=#0000ff><FONT
size=-1><A href="http://www.idseng.com/"
target=_blank>http://www.idseng.com</SPAN><SPAN
class=070420601-28022006></A> </FONT></FONT></FONT></SPAN>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr><FONT face=Tahoma><FONT
size=-1>-----Original Message-----</FONT></FONT> <BR><FONT
face=Tahoma><FONT size=-1><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org [<A
href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</A>]<B>On
Behalf Of </B>Jay Marshall</FONT></FONT> <BR><FONT face=Tahoma><FONT
size=-1><B>Sent:</B> Tuesday, February 28, 2006 4:23 PM</FONT></FONT>
<BR><FONT face=Tahoma><FONT size=-1><B>To:</B> NSRCA Mailing
List</FONT></FONT> <BR><FONT face=Tahoma><FONT size=-1><B>Subject:</B> Re:
[NSRCA-discussion] NiMH follow up</FONT></FONT></DIV><SPAN
class=156521521-28022006><FONT face=Arial><FONT color=#0000ff><FONT
size=-1>You are correct on the rate. The time is dependatn upon how much
of the original charge remains. A good charger will charge only as long as
necessary to meet its full chare specification (voltage,
etc.).</FONT></FONT></FONT></SPAN></BLOCKQUOTE><PRE><HR width="90%" SIZE=4>_______________________________________________
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