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<DIV><FONT face=Arial size=2>A warning to all:</FONT></DIV>
<DIV><FONT face=Arial size=2>Here is a real potential problem. We are
talking about NiCd and NiMH charging. Recently two guys have burned up
packs in their planes. I get called because they think it was caused by my
switch harnesses. I got suspicious when I found out both were using
parallel packs and switch harnesses. I remember when Chip Hyde first
started using the original Duralites in parallel he found he could not
charge both at the same time if they were both plugged into the
receiver. We found it was due to the sensing resistors in the return
wires from the batteries being charged, being short circuited by the connection
in the receiver. This confuses the charger. I wasn't sure if the
Schulze and the other sophisticated chargers used low side current sensing so I
asked. I didn't get a perfectly clear answer but you can see the German
approach.</FONT></DIV>
<DIV><FONT face=Arial size=2>If you don't know if your charger has this
potential problem don't charge simultaneously unless you unplug one from the
receiver.</FONT></DIV>
<DIV>
<DIV><FONT face=Arial size=2>For those of you following the discussion of the
NMP Li-Ion charger, it does not have low side current sensing, it has a meter in
the high side, and it is perfectly okay to charge in parallel simultaneously in
the plane.</FONT></DIV>
<DIV><FONT face=Arial size=2>Jim</FONT></DIV></DIV>
<DIV>----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial">
<DIV style="BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A
title=hotline@schulze-elektronik-gmbh.de
href="mailto:hotline@schulze-elektronik-gmbh.de">hotline@schulze-elektronik-gmbh.de</A>
</DIV>
<DIV><B>To:</B> <A title=JOddino@socal.rr.com
href="mailto:JOddino@socal.rr.com">JOddino@socal.rr.com</A> </DIV>
<DIV><B>Sent:</B> Saturday, May 08, 2004 4:00 AM</DIV>
<DIV><B>Subject:</B> Re: Parallel charging</DIV></DIV>
<DIV><BR></DIV>
<DIV style="FONT: 10pt Courier New; COLOR: #000000">you ALWAYS have to charge
batteries directly and all alone connected to the charger.</DIV>
<DIV style="FONT: 10pt Courier New; COLOR: #000000"> </DIV>
<DIV style="FONT: 10pt Courier New; COLOR: #000000">
<DIV>
<DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>
<DIV><FONT face=Arial>Best regards</FONT></DIV>
<DIV><FONT face=Arial>Matthias Schulze</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial>Schulze Elektronik GmbH</FONT></DIV>
<DIV><FONT face=Arial>Prenzlauer Weg 6</FONT></DIV>
<DIV><FONT face=Arial>64331 Weiterstadt</FONT></DIV>
<DIV><FONT face=Arial>Germany</FONT></DIV></FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Fon: +49-6150-1306-5 (sales + answering
machine)
<DIV><FONT face=Arial>Fon: +49-6150-1306-98 (hotline daily 14:00-16:00 local
time CET)</FONT></DIV>
<DIV></FONT><FONT face=Arial>Fax: +49-6150-1306-99</FONT></DIV></DIV>
<DIV>
<DIV>
<DIV>
<DIV><FONT face=Arial></FONT> </DIV></DIV>
<DIV>
<DIV>
<DIV>eMail: <A
href="mailto:sales@schulze-elektronik-gmbh.com">sales@schulze-elektronik-gmbh.com</A> for
your order(s)</DIV>
<DIV>eMail: <A
href="mailto:hotline@schulze-elektronik-gmbh.com">hotline@schulze-elektronik-gmbh.com</A> for
technical support</DIV>
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href="http://www.schulze-elektronik-gmbh.com/">http://www.schulze-elektronik-gmbh.com</A></DIV></DIV></DIV>
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<DIV style="FONT: bold 9pt Arial">Original
Message </DIV></TD>
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<DIV style="FONT: 8pt Arial"><STRONG><FONT color=#808080> processed
by Tobit InfoCenter</FONT></STRONG> </DIV></TD></TR>
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<DIV style="FONT: bold 9pt Arial">Subject: </DIV></TD>
<TD bgColor=#efefef><FONT face=Arial,Helvetica><FONT size=-1>Parallel
charging (07-Mai-2004 4:24)</FONT></FONT></TD></TR>
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<DIV style="FONT: bold 9pt Arial">From: </DIV></TD>
<TD bgColor=#efefef><FONT face=Arial,Helvetica><FONT size=-1><A
href="mailto:JOddino@socal.rr.com">JOddino@socal.rr.com</A></FONT></FONT></TD></TR>
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<TD style="PADDING-LEFT: 4px" width=80 bgColor=#efefef>
<DIV
style="FONT: bold 9pt Arial">To: </DIV></TD>
<TD><FONT face=Arial,Helvetica><FONT size=-1><A
href="mailto:hotline@schulze-elektronik-gmbh.com">hotline@schulze-elektronik-gmbh.com</A></FONT></FONT></TD></TR></TBODY></TABLE>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Is it possible that the charger gets confused if
two batteries are being charged simultaneously with two chargers and the
batteries being charged have their returns connected as they are when they are
plugged into a single receiver through typical R/C switches?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Is there some type of current sensing in the
return line that would not function properly with two in
parallel?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks in advance.</FONT></DIV>
<DIV><FONT face=Arial size=2>Jim Oddino</FONT></DIV></BLOCKQUOTE></BODY></HTML>