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I typically have a mix of charged and uncharged packs (sets of 5s 5000 packs). The cell pro 10sx can use up to 24v supply, so I simply use a charged 5s pack as the power source and charge a spent 5s pack to storage capacity. They both end up at a storage
capacity.
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<div>-M<br>
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<div>On Oct 11, 2015, at 10:40 PM, Ed Alt via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>> wrote:</div>
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<div dir="ltr">That is an excellent feature!<br>
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To: <a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a><br>
Date: Mon, 12 Oct 2015 02:39:16 +0000<br>
Subject: Re: [NSRCA-discussion] LiPo Fun Fact 'O The Day<br>
From: <a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a><br>
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<p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;">As far as discharging, the Turnigy Reaktor I have (
<a href="http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=70272" target="_blank">
http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=70272</a> ) has a regenerative discharge feature. It can discharge at the full rate it can charge at as long as you use a battery to charge with. It will return the current back to your charging
battery. Really kewl and nice feature to be able to discharge your packs in 15-20 minutes.</span></p>
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<p class="ecxMsoNormal" style="text-indent:-.25in;"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;"><span style="">-<span style="font:7.0pt "Times New Roman";">
</span></span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;"> Robert Beaubien</span></p>
<p class="ecxMsoNormal" style="text-indent:-.25in;"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;"><span style="">-<span style="font:7.0pt "Times New Roman";">
</span></span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;"> Sr. Software Architect</span></p>
<p class="ecxMsoNormal" style="text-indent:-.25in;"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;"><span style="">-<span style="font:7.0pt "Times New Roman";">
</span></span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F4E79;"> Kool Software LLC</span></p>
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<p class="ecxMsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;">“Dear Algebra, Please stop asking us to find your X. She's never coming back and don't ask Y.”</span></p>
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<p class="ecxMsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext;">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext;"> NSRCA-discussion [<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>]
<b>On Behalf Of </b>Karl Watts via NSRCA-discussion<br>
<b>Sent:</b> Sunday, October 11, 2015 1:37 PM<br>
<b>To:</b> General pattern discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
<b>Subject:</b> Re: [NSRCA-discussion] LiPo Fun Fact 'O The Day</span></p>
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<p class="ecxMsoNormal">Ok, so hearing all the discussion here I am trying to capture some take home points to use in the care of my batteries.</p>
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<p class="ecxMsoNormal">1. Do not keep them at full charge for extended periods of time. Charge prior to flying and the ones I do not use discharge after getting home. My problem is it takes sooooo much longer for my charger (iCharger 208B) to discharge
a battery to storage than to full charge a battery from storage. Question - My charger will discharge a battery to 50% capacity for storage, is it OK to store them at lower capacity? What is the low limit?</p>
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<p class="ecxMsoNormal">2. Discharge for storage over the winter or in between flight sessions. Question - Is it better to store them in the refrigerator for longer life?</p>
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<p class="ecxMsoNormal">3. Warm up cold batteries before charging. Warm up cold batteries before using.</p>
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<p class="ecxMsoNormal">4. Do not discharge batteries below 25% capacity.</p>
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<p class="ecxMsoNormal">5. Charge batteries at 1-2 C, no higher, to be on the safe side. Note there is controversy with this point.<br>
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Is that all?</p>
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<p class="ecxMsoNormal">Karl - an enthusiastic intermediate pattern pilot</p>
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Sent from my iPad</p>
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On Oct 10, 2015, at 8:08 PM, Jeff and Claire via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>> wrote:</p>
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<p class="ecxMsoNormal"><span style="font-family:"Comic Sans MS";color:windowtext;">Yes, warm to at least 50deg F before charging. Was charging at the field last winter and the Powerlab6 was stopping charge at 90% of capacity. Thought the charger was broken.
Turns out they use the internal temp sensor to check ambient as well and if below 50F, it will stop at 90% to keep from damaging the battery (with the assumption that battery is also <50F). The Powerlabs allow lowering that threshold to 41F, once I did that
started getting full charges (but made sure the batteries stayed warm before charge via thermo-nuclear fusion (truck dashboard). </span></p>
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<p class="ecxMsoNormal"><span style="font-family:"Comic Sans MS";color:windowtext;">From FMA Revolectrix engineering group:
</span><span style="font-family:"Calibri",sans-serif;background:#F2F4F5;">Lithium is a poor performing battery in cold weather. If the pack is cold, the cell damage voltage reduces from 4.35V down to 4.20V. That means charging a lithium pack to 100% when it
is below 50 deg F will reduce cycle life.</span><span style="font-family:"Calibri",sans-serif;"> Automatic temperature monitoring prevents pack over-charging at low ambient temperatures</span></p>
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<p class="ecxMsoNormal"><span style="font-family:"Comic Sans MS";color:windowtext;">They also say:
</span><span style="font-size:10.0pt;">LiPo packs charged to 100% should not be cooled below room temperature. Cells at 90% or less capacity can be cooled below 32ºF (0ºC).
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<p class="ecxMsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext;">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext;"> NSRCA-discussion [<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>]
<b>On Behalf Of </b>Stuart Chale via NSRCA-discussion<br>
<b>Sent:</b> Saturday, October 10, 2015 9:01 AM<br>
<b>To:</b> <a href="mailto:chuenkan@comcast.net">chuenkan@comcast.net</a>; General pattern discussion<br>
<b>Subject:</b> Re: [NSRCA-discussion] LiPo Fun Fact 'O The Day</span></p>
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<p class="ecxMsoNormal" style="">What about if you store them in the fridge during the week. Should they warm to room temp before charging or is charging them cold OK?</p>
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<p class="ecxMsoNormal">On 10/10/2015 10:08 AM, Phil Spelt via NSRCA-discussion wrote:</p>
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<p class="ecxMsoNormal"><span style="font-family:"Arial",sans-serif;">Correct!!! I don't do that...</span></p>
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<p class="ecxMsoNormal"><span style="font-family:"Helvetica",sans-serif;background:#FFFF99;">Apparently you guys never put them on charge when they're hot</span><span style="font-family:"Helvetica",sans-serif;">!! Then they definitely cool down while charging.
:)<br>
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Sent from my average intelligence phone </span></p>
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On Oct 9, 2015, at 8:44 PM, Robert L. Beaubien via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank">nsrca-discussion@lists.nsrca.org</a>> wrote:</span></p>
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