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<DIV><FONT color=#000000>I have had a few (4) of my 2000 mAh Li-ions fail in the
last couple of months.</FONT></DIV>
<DIV><FONT color=#000000></FONT> </DIV>
<DIV><FONT color=#000000>The failure only occurs during charging and when the
outside temperature is very hot. </FONT></DIV>
<DIV><FONT color=#000000></FONT> </DIV>
<DIV><FONT color=#000000>I was not sure what it was at first. I did read the
warnings on some cell phone batteries that I use as set-up packs, and it says do
not get hotter than 140F. Yesterday I actually caused it to happen at the field
(and when I was taking notice.)</FONT></DIV>
<DIV><FONT color=#000000></FONT> </DIV>
<DIV><FONT color=#000000>I had a spare 2000 pack in my van, left over from my
Nat's trip. It was on the tailgate area and caught some sun. It was showing 8.12
V so I plugged it in to charge it up. The meter did not move, so I tested
the voltage again. No volts. My laser-temp showed 143 F. After a teardown I
found one cell as good as open with .05V. </FONT></DIV>
<DIV><FONT color=#000000></FONT> </DIV>
<DIV><FONT color=#000000>Based on other feedback I believe that what happens is
the cell blows a sort-of-fuse internally if hot (140+ F) and a charge is
applied. Could be a safety feature for all that know?</FONT></DIV>
<DIV><FONT color=#000000></FONT> </DIV>
<DIV><FONT color=#000000>It does not (or has not so far) failed if current is
drained when this hot. I have one in a Radio South ni-starter that get warm and
is mistreated , but does not fail.</FONT></DIV>
<DIV><FONT color=#000000></FONT> </DIV>
<DIV><FONT color=#000000>In practical terms what happens to you is that when you
switch on there is no juice. So no juice, no fly, no plane loss....</FONT></DIV>
<DIV><FONT color=#000000></FONT> </DIV>
<DIV><FONT color=#000000>Please regard this as a "heads-up' to not charge your
Li-ions if they are hot. Wait until they cool down.</FONT></DIV>
<DIV><FONT color=#000000></FONT> </DIV>
<DIV><FONT color=#000000>Regards,</FONT></DIV>
<DIV><FONT color=#000000><BR>Eric.</FONT></DIV>
<DIV><FONT color=#000000></FONT> </DIV>
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