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<DIV>The research I did says the chemical properties of a lipo break down on
full discharge to a state where they are not environmentally harmful.
However, if you don't agree, physically disposing of the discharge lipos in a
environmentally 'safe' certainly will be the safest way to get rid of
them. </DIV>
<DIV> </DIV>
<DIV>Don</DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 8/30/2009 8:00:17 A.M. Pacific Daylight Time,
chuenkan@comcast.net writes:</DIV>
<BLOCKQUOTE
style="BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial><FONT
color=#ff0000 size=5><B>You do NOT "just throw rechargeable batteries into the
trash".</B></FONT><FONT size=3> <BR><BR> Cadmium and lithium are heavy
metals that cause harm to biological systems when ingested improperly -- i.e.
from seeping into the water table from landfills. Lithium is used in
SMALL QUANTITIES to treat some kinds of mental disorders, but that is under
rigid manufacturing and dosing conditions. Lead is also a heavy metal,
that is why there is an extra charge when one buys a car battery without a
"trade-in". <BR><BR>I was in RadShack the other day, and we happened to
start talking about recycling these batteries -- they will take ANY
rechargeable battery except auto batteries, including our R/C NicCads and
Lipos, with no charge, and send them to a proper recycling center. You
can also usually take them to local govt. recycling centers for no
charge. Here in Oak Ridge, TN, every Wed and one Saturday per month the
center is open for all kinds of hazardous items -- old PCs and TVs, paint,
florescent bulbs, and on, and on.<BR><BR>PLEASE recycle - not because of
tree-hugging, but for human and animal safety...<BR><BR>At 10:16 AM 8/30/2009,
you wrote:<BR></FONT>
<BLOCKQUOTE class=cite cite="" type="cite"><FONT size=2
face="Arial, Helvetica">There are many ways to drain the battery down to
safe levels. I have heard the lipos are 'safe' anywhere below 2V per
cell, however, I figure as long as I have something draining them, I just
leave them on the load until they are basically 'dead'.<BR> <BR>For
anything up to 3 cells, I use an automobile tail light bulb. Just
solder 2 leads onto the bulb at the 2 contact points and clip the other ends
onto the battery leads. For a 5 cell pack, I would use 2 bulbs in
series. Put them in a safe area, clip the bulbs on and leave them for
a couple days. Check the voltage from time to time and when it gets
down to about zero, just throw the battery in the trash.<BR> <BR>I
tried the salt water bath approach and it didn't do anything for me.
After a couple days, the voltage had declined very little so I took the
light bulb approach. Actually anything that puts a load on the
batteries will work. A large resistor, light bulb, old brushed motor,
etc.<BR> <BR>Don<BR> <BR>In a message dated 8/30/2009 6:10:08 A.M.
Pacific Daylight Time, Snaproll4@aol.com writes:<BR></FONT>
<DL>
<DD><FONT size=3 face="Arial, Helvetica">I have a Li-Po pack(5000) that
needs to be thrown away. It does not appear to be physically
damaged, but I need to know about the voltage. How low should I
discharge it and I how do I do that? My TP charger would take it
down to 3.3 volts/cell.<BR>
<DD><BR>
<DD>TIA.<BR>
<DD><BR>
<DD>Steve<BR><BR>
<HR>
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<P></X-SIGSEP><B><I>--></FONT><FONT color=#800000 size=3
face="Arial, Helvetica"> There are only two types of aircraft -- fighters and
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