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<DIV><SPAN class=682573516-08052004><FONT face=Arial color=#0000ff
size=2>Frank,</FONT></SPAN></DIV>
<DIV><SPAN class=682573516-08052004><FONT face=Arial color=#0000ff
size=2> IF you have any documents that state ANYTHING that are dated as to
the use & Cautions of Li-metal & Li-ion could you please forward to
me.</FONT></SPAN></DIV>
<DIV><SPAN class=682573516-08052004><FONT face=Arial color=#0000ff
size=2> Any cost involved I will gladly pay. I am very interested in
anything 1 year and older.</FONT></SPAN></DIV>
<DIV><SPAN class=682573516-08052004><FONT face=Arial color=#0000ff
size=2>
Cameron Smith</FONT></SPAN></DIV>
<DIV><SPAN class=682573516-08052004><FONT face=Arial color=#0000ff
size=2>
<A
href="mailto:dentdoc007@bellsouth.net">dentdoc007@bellsouth.net</A></FONT></SPAN></DIV>
<DIV><SPAN class=682573516-08052004><FONT face=Arial color=#0000ff
size=2>
770-596-7699</FONT></SPAN></DIV>
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<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
discussion-request@nsrca.org [mailto:discussion-request@nsrca.org] <B>On
Behalf Of </B>Frank Bis<BR><B>Sent:</B> Saturday, May 08, 2004 12:02
PM<BR><B>To:</B> NSRCA Discussion List<BR><B>Subject:</B> Safety Concerns
Charging Lithium-Ion and Solid Anode lithium Batteries (Duralite)
<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>I have been working in the battery area for 40 +
years so let me pass on my knowledge. When the Duralites first hit the
market I went on line and said "<STRONG>Be very careful with these solid
lithium anode cells</STRONG>"- they can vent catch on fire etc especially
after repeated cycling. The reason for this is after several charges the
lithium forms Dendrites (spikes on the surface) which punch through the
separator and short out the cell. No one paid any attention to
this. Now in the case of the Lithium-Ion these cells <STRONG>DO NOT LIKE
TO BE OVERCHARGED.i.e. above 4.2 volts.</STRONG> They will vent and
catch on fire. I use them in flat packs but each cell has a protective
circuit on the cell and can be charged at constant current using a standard
charger at 250 mA. When any cell in the two cell pack reaches 4.2 V
the protective circuit on the cell senses this and takes the cell off line,
hence the battery of two cells off charge. Yes these battery packs are a
bit lighter and have a higher energy density (Wh/kg). Let me pose this,
Nickel-cadmium cells are a proven technology and can be fast charged safely
and work. Why not stay with they. The Nickel-metal hydride is a
good system. However, it looses capacity on stand, and requires careful
field charging to prevent it from getting too hot and venting. Also it
does not work as well at low temperatures. My advice stay with
Ni-Cd.</FONT></DIV></BLOCKQUOTE></BODY></HTML>