<font color='black' size='2' face='arial'>The <font size="2">salt water bath approach has been floating around for quite some time, however, there is a<u> possible</u> issue with this approach. Here is a section of an article from a club newsletter describing the possible issue. <br>
<br>
YMMV<br>
Don<br>
<br>
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<div style="margin-bottom: 0in"><font face="Arial, sans-serif"><font size="2"><u><b>Salt
Water Bath.... NO!!!</b></u></font></font></div>
<div style="margin-bottom: 0in"><br>
</div>
<div style="margin-bottom: 0in"><font face="Arial, sans-serif"><font size="2">There
has been a discharge approach for lipos floating around the internet
for quite some time. Somehow, it just won't die and go away so we will cover it here and maybe help someone reading this that thinks
this will reliably discharge a lipo. Notice I said 'reliably'. The
salt water bath approach 'might' work but there is no easy way to
check whether it worked or not and you might be disposing a lipo
you think is fully discharged but isn't.</font></font></div>
<div style="margin-bottom: 0in"><br>
</div>
<div style="margin-bottom: 0in"><font face="Arial, sans-serif"><font size="2">The
theory..... Pure water will not conduct energy, in fact has almost
infinite resistance. BUT, add some chemical like salt and it will
conduct current very well. So, if we take water and add salt to it,
drop a lipo pack in the salty water it should gradually/safely
discharge the lipo to zero voltage over time by allowing current to
flow between the positive and negative leads of the pack. Sounds
good, right? Theoretically it should work... BUT it ignores the
fact that the salty water will also cause a oxidation/corrosion
process to occur as the energy flows across the connectors of the
pack, including the aluminum connectors<u> inside</u> the pack. Over time,
this oxidation/corrosion process eats away at the aluminum of the
internal connectors of the lipo gradually dissolving it. Now, as
soon as this process erodes the connector(s) to the point there is no
connection between one or more of the cells of the lipo it will open
the circuit and you will get a zero volt reading when you check the
pack using the main leads. You can't see the internal connectors so
you have no idea the reason you are getting a zero voltage reading
externally is there is an 'open' in the internal circuit of the lipo
pack. Of course, this might not occur and the salt water bath would
be successful but you have no way of determining if it was actually
successful without opening the pack up to verify each cell is zero
voltage. So, that is the reason you shouldn't rely on the salt water
bath to discharge lipo packs.</font></font></div>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Jay Gerber <jaysgerber@earthlink.net><br>
To: 'Terrence Walker' <tewalker10@yahoo.com>; 'General pattern discussion' <nsrca-discussion@lists.nsrca.org>; atwooddon <atwooddon@aol.com><br>
Sent: Mon, Apr 18, 2016 6:39 am<br>
Subject: RE: [NSRCA-discussion] Li-Po Battery disposal - Best way<br>
<br>
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<div class="MsoNormal"><span style="font-size:14.0pt;font-family:"Arial","sans-serif"">For whatever it’s worth….If you can’t get to a battery disposal facility like Lowe’s, etc…..</span></div>
<div class="MsoNormal"><span style="font-size:14.0pt;font-family:"Arial","sans-serif""> </span></div>
<div class="MsoNormal"><span style="font-size:14.0pt;font-family:"Arial","sans-serif"">I have discharged batteries using a glass bowl (not metal) filled with a concentrated salt water solution. 2- 5S 5400 ma Lipos took about 2 days for them to get to 0.01 volts. Yesterday I discharged 2 4S 2200 Lipos in a day to 0.00 volts with the same process. No danger, just let them sit and maybe refresh the solution for the bigger batteries. Leave a little longer and they will go to 0.00 volts</span></div>
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<div class="MsoNormal"><span style="font-size:14.0pt;font-family:"Arial","sans-serif"">Strip the leads staggered and watch that the positive lead doesn’t get caked up in a day or so. It’s neat watching the bubbling taking place as the “electrons” flow out of the packs.</span></div>
<div class="MsoNormal"><span style="font-size:14.0pt;font-family:"Arial","sans-serif"">Jay</span></div>
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<div class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> NSRCA-discussion [<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org?">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>] <b>On Behalf Of </b>Terrence Walker via NSRCA-discussion<br>
<b>Sent:</b> Monday, April 18, 2016 12:44 AM<br>
<b>To:</b> <a href="mailto:atwooddon@aol.com">atwooddon@aol.com</a>; General pattern discussion<br>
<b>Subject:</b> Re: [NSRCA-discussion] Li-Po Battery disposal - Best way</span></div>
</div>
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<div class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black">Hello Don,</span></div>
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<div class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black">Long time no see. So I have an old 5000 10s flight pack that I want to fully discharge. How can a single 12v taillight bulb discharge this flight pack?</span></div>
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<div class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black">Enquiring minds want to know ...<span style="border:solid windowtext 1.0pt;padding:0in"><img id="yui_3_16_0_ym19_1_1460945388519_28009" alt="Image removed by sender. *:P tongue" removedimage__f4d56a5e-1b10-4497-9fcf-1fd1e346a325__src="cid:~WRD000.jpg"></span></span></div>
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<div class="MsoNormal" style="background:white"><span style="font-family:"Helvetica","sans-serif";color:black">Terry </span></div>
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<div class="MsoNormal" style="text-align:center;background:white" align="center"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><hr align="center" size="1" width="100%"></span></div>
<div class="MsoNormal" style="background:white"><b id="yui_3_16_0_ym19_1_1460945388519_27745"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">From:</span></b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> atwooddon--- via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
<b>To:</b> <a href="mailto:ldiamond@diamondrc.com">ldiamond@diamondrc.com</a>; <a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a> <br>
<b id="yui_3_16_0_ym19_1_1460945388519_27748">Sent:</b> Saturday, April 16, 2016 6:44 AM<br>
<b>Subject:</b> Re: [NSRCA-discussion] Li-Po Battery disposal - Best way</span><span style="font-family:"Helvetica","sans-serif";color:black"></span></div>
</div>
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<div class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">The process I use is to fully discharge the pack using a automotive tail light bulb, strip the mail leads back a couple inches and twist them together then dispose of if in the trash. Fully discharged, lipos pose no environmental dangers.<br>
<br>
Don</span><span style="font-family:"Helvetica","sans-serif";color:black"></span></div>
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<div class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">-----Original Message-----<br>
From: Larry Diamond via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
To: 'General pattern discussion' <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
Sent: Sat, Apr 16, 2016 6:24 am<br>
Subject: [NSRCA-discussion] Li-Po Battery disposal - Best way</span></div>
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<div class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:black">I have a LiPo 5s 5000mAh pack that has a dead cell (1.6v).</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"></span></div>
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<div class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:black"> </span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"></span></div>
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<div class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:black">What is the best way to dispose of this battery?</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"></span></div>
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<div class="MsoNormal" style="background:white"><span style="font-size:11.0pt;font-family:"Arial","sans-serif";color:black">Larry Diamond</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"></span></div>
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