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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='tab-interval:.5in'><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>Using only about 45% of capacity it didn't make sense to charge to 4.2 so I set the charge cutoff to 4.15 last year which charges to about 95%. I have no proof but the batteries seam happier with the lower charge voltage.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'>Jim<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";mso-bidi-font-family:"Times New Roman";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-font-family:"Times New Roman"'> NSRCA-discussion [mailto:nsrca-discussion-bounces@lists.nsrca.org] <b>On Behalf Of </b>Dave Lockhart via NSRCA-discussion<br><b>Sent:</b> Friday, October 09, 2015 6:21 AM<br><b>To:</b> 'General pattern discussion'<br><b>Subject:</b> Re: [NSRCA-discussion] FW: 10s LiPo Charger Recommendation<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Some random comments to a long thread –<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I believe a number of commercial lipo applications specifically limit “full charge” voltage to less than 4.2 volts, and limit “discharged” voltage to something higher than 3.5 volts. Operating the lipo in the middle of the voltage range increases longevity and reduces the odds of failure. I’ve asked a number of “experts” if RC applications would be better served by operating between 4.2 and 3.75 (typical), or 4.15 and 3.7, or 4.3 and 3.8……never received a clear answer. Hyperion is another lipo supplier that has been advertising 4.35 volt capability for several months now on their latest generation of lipo cell.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>ThunderPower might know the most about charging lipos for RC use, since they have been doing it as long as anyone? The earliest viable packs for pattern use were various “4p” configurations. Early lipo cells could not support high discharge rates, so putting cells in parallel was the only option to support high discharge rates - even then, the first pattern packs had a 6C BURST rating. ThunderPower moved away from the “4p” configurations as soon as it was viable to do so.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I don’t personally like the idea of parallel charging…simply because I want to see the voltage of each cell….and mah to recharge each pack…which is also part of the reason why I run the TP5s5000 packs instead of the 5s5400s (which are actually 10 2700s in 5s2p configuration). Tracking the voltage at the end of a flight vs the mah needed to recharge tells you quite a bit about the actual capacity of the cells.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Several years ago, I tried 2C charging (packs were rated for 5C charging). I have not done it since, as I believe 2C charging reduced the lifecycles of the packs by about 30%. I’ll also note that with smaller packs used for indoor flying, 3C charging seems to have negligible impact on lifecycle. When time allows, I charge my pattern packs at 3.5 amps…figuring if 1C charging is better than 2C charging…. 0.7C charging might be better yet.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The number of good chargers out there is far greater than in the past….the weak point with all of the chargers / charging systems is the balance connectors….they wear out, get dirty, etc, causing false readings in the chargers.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Solid power supplies are much cheaper than in the past. If I needed a new power supply, I’d go for a pair of the 75 amp HP server power supplies (contact RVP….he has them cheap with leads attached)….lots of charging power, compact, and easy to put a pair in series for 1800 watts of power (more than a 15 amp household circuit)…..enough to comfortably power a wide range of charging schemes. I currently have 2 different charger boxes….one has a pair of IOTA 55 amp supplies in series running a pair of TP820s, and the newer charger box has a pair of HP 47 amp supplies (much lighter) in series running a pair of TP820s. Both charger boxes have more than enough overhead (chargers and supplies) to charge 4 5s5000s at 2C, should I need to charge rapidly. Wiring to and from the power supplies becomes increasingly critical as the wattage goes up….at a 1000 watts, plenty of computer monitor power leads (intended for less than 100 watts) will get hot. Power leads intended for the power supplies have a lot more capacity.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dave<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='mso-outline-level:1'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri","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>Peter Vogel via NSRCA-discussion<br><b>Sent:</b> Friday, October 09, 2015 12:40 AM<br><b>To:</b> Robert L. Beaubien <<a href="mailto:rob@koolsoft.com">rob@koolsoft.com</a>>; NSRCA List <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br><b>Subject:</b> Re: [NSRCA-discussion] FW: 10s LiPo Charger Recommendation<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>If you go to 4.35v/cell your 10s pack voltage is in excess of that allowed by the rules by 1.5v<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Peter+<o:p></o:p></p><div><p class=MsoNormal>Sent from <a href="http://aka.ms/Ox5hz3">Outlook</a><o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'>On Thu, Oct 8, 2015 at 8:46 PM -0700, "Robert L. Beaubien via NSRCA-discussion" <<a href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank">nsrca-discussion@lists.nsrca.org</a>> wrote:<o:p></o:p></p><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ed, </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I have talked with a number of battery manufacturers and while their batteries support as high as 9c charge rates, every one recommend NOT charging any higher than 2c charging rates. Anything higher, while tolerated by the battery, would definitely shorten the life of the battery. The best benefit of parallel charging is not using a high C charge rate, but that you are charging multiple batteries at the same time. It reduces the need to have to charge fast (at least for me).</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Also, I’m looking forward to the coming HV Lipo packs where you charge the cells to 4.35v/cell instead of 4.2v/cell. Turnigy ( <a href="http://hobbyking.com/hobbyking/store/__1415__85__Batteries_Accessories-Turnigy_BOLT_LiHV_.html">http://hobbyking.com/hobbyking/store/__1415__85__Batteries_Accessories-Turnigy_BOLT_LiHV_.html</a> ) has them already and GiantPower is close to releasing their packs with these cells. They should give a nice boost in performance for a similar weight battery.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div><p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><span style='font-family:"Calibri","sans-serif"'>-</span><span style='font-size:7.0pt'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79'> Robert Beaubien</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><span style='font-family:"Calibri","sans-serif"'>-</span><span style='font-size:7.0pt'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79'> Sr. Software Architect</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.5in;text-indent:-.25in'><span style='font-family:"Calibri","sans-serif"'>-</span><span style='font-size:7.0pt'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79'> Kool Software LLC</span><o:p></o:p></p><p class=MsoNormal style='margin-left:.25in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><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><o:p></o:p></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='mso-outline-level:1'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> Ed Alt [<a href="mailto:ed_alt@hotmail.com">mailto:ed_alt@hotmail.com</a>] <br><b>Sent:</b> Thursday, October 8, 2015 6:10 PM<br><b>To:</b> Robert L. Beaubien <<a href="mailto:rob@koolsoft.com">rob@koolsoft.com</a>>; NSRCA List <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br><b>Subject:</b> RE: [NSRCA-discussion] FW: 10s LiPo Charger Recommendation</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><div><div><p class=MsoNormal>Thanks for the response Robert. I can definitely see doing this at low to moderate C rates as with your example. I might run a test to see what the voltage difference is between parallel battery sets at higher C rates, maybe around 4 to 5C. The thing that I have in mind is, that depending on how things are connected, what the resulting resistance is in the path to the 2nd, 3rd, 4th parallel pack and so forth, and what the charging current is, then you might see a problem with some packs charging more than others. If you keep the the wiring lengths the same from the charger to each pack, then there should not be an issue. An example might be something resembling a bicycle wheel, with the charger at the hub of the wheel, and battery packs distributed around the hub with one pack per "spoke".<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>However, if you instead choose to wire it to resemble a train track, with a relatively simple charger at one end of the track and battery packs strung out like railroad ties along the rails, then a issue may exist at some point. The reason is that the higher the charging current value is, the more voltage drop there will be along the wiring from one pack to the next, skewing the results from one pack to the next. Now depending on how the charger algorithm is designed, that may not matter. For example, an improved charger design could pulse the charging current on and off, and during each brief "off" time, take no load voltage readings that would be virtually unaffected by the extra resistance in the wiring to the 2nd pack. More sophisticated methods could be applied that you might expect could vary from one brand or model charger to the next, but this should illustrate the point that results may vary depending on a number of factors. <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Careful monitoring and not pushing C rates really high as you have done will certainly tell you enough. If someone wants to really push the limits without incurring too much risk, my suggestion is that they determine the wiring method based on an understanding of how the charging system will be able to measure what is happening. If your charging system can monitor individual parallel pack voltages and suss out how those separate readings relate to the state of the group of batteries, you get easily push C rates higher without much regard to the wiring scheme (hub and spoke vs RR track, if you will). If your charging system lacks independent battery voltage sensors, but is known to have an algorithm that can work around that, also good. Personally, I wouldn't go against any manufacturer's specific recommendation to avoid parallel charging with their product. <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Ed<o:p></o:p></p></div><div><div><p class=MsoNormal> <o:p></o:p></p><div><div class=MsoNormal align=center style='text-align:center'><span style='mso-fareast-font-family:"Times New Roman"'><hr size=2 width="100%" align=center></span></div><p class=MsoNormal style='margin-bottom:12.0pt'>To: <a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a><br>Date: Thu, 8 Oct 2015 20:39:19 +0000<br>Subject: Re: [NSRCA-discussion] FW: 10s LiPo Charger Recommendation<br>From: <a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>.<o:p></o:p></p><div><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I have done a lot of parallel charging this year. I was originally worried about cell balance charging this way when I started so I closely monitored the cell voltages before and after charging. I’m typically charging 1800 75c 4s packs, 4 at a time at 14amps (2c per pack). Every check of the cells after charging shows they balance very well and are within .02 volts each and I have about 100 cycles on each pack this way. I use the RMRC ParaBoard ( <a href="http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=84_387&products_id=2984" target="_blank">http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=84_387&products_id=2984</a> ). Certainly not the 10s packs used in pattern, but charging them as 5s packs would work nicely using this system.</span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div><p class=ecxmsonormal style='text-indent:-.25in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79'>-</span><span style='font-size:7.0pt;color:#1F4E79'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79'> Robert Beaubien</span><o:p></o:p></p><p class=ecxmsonormal style='text-indent:-.25in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79'>-</span><span style='font-size:7.0pt;color:#1F4E79'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79'> Sr. Software Architect</span><o:p></o:p></p><p class=ecxmsonormal style='text-indent:-.25in'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79'>-</span><span style='font-size:7.0pt;color:#1F4E79'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F4E79'> Kool Software LLC</span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><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><o:p></o:p></p></div><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=ecxmsonormal style='mso-outline-level:1'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri","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>Ed Alt via NSRCA-discussion<br><b>Sent:</b> Thursday, October 8, 2015 12:54 PM<br><b>To:</b> Keith Hoard <<a href="mailto:klhoard@outlook.com">klhoard@outlook.com</a>>; General pattern discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br><b>Subject:</b> Re: [NSRCA-discussion] FW: 10s LiPo Charger Recommendation</span><o:p></o:p></p></div></div><p class=ecxmsonormal> <o:p></o:p></p><div><p class=ecxmsonormal>Although I haven't done parallel charging, it seems like it would be ok within certain limits. The main limiting factor might be the path resistance between parallel cells, but really only in the case of high C rate charging. That's a theory anyway. What has your experience been at high C rates? Does it seem to make much difference?<o:p></o:p></p></div><div><p class=ecxmsonormal> <o:p></o:p></p></div><div><p class=ecxmsonormal>Ed<o:p></o:p></p></div><div><p class=ecxmsonormal><br>On Oct 8, 2015, at 3:09 PM, Keith Hoard via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>> wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=ecxmsonormal> <o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I have found that the loudest detractors of parallel charging have no experience parallel charging. When I ask them to point to an incident where parallel charging caused a problem, the answer is always “Well, I read on the internet . . . “</span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>.</span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I do a lot of parallel charging, and have no problem “putting the spurs” to my packs during charge if I’m ready to get in the air. To dispel one myth right now, a good quality charger **WILL** detect a bad cell during parallel charging. </span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>(steps up on soapbox) . . . </span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:14.0pt;font-family:"Berlin Sans FB","sans-serif";color:red'>**I HAVE ACTUALLY SEEN IT WITH MY OWN EYES AND CONFIRMED IT WITH FURTHER TESTS**</span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:14.0pt;font-family:"Berlin Sans FB","sans-serif";color:red'>**PLEASE DON’T KEEP REFERRING ME BACK TO “THE INTERNET”**</span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:14.0pt;font-family:"Berlin Sans FB","sans-serif";color:red'>**IF YOU GIVE ME ONE OF YOUR CRAPPY PUFFED UP PACKS, I’LL PUT IT ON WITH ONE OF MY GOOD PACKS AND SHOW YOU**</span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>OK, with that statement out of the way . . . . (steps down off soapbox) . . . . </span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The only time that bad cell **MAY** be masked is if you are parallel charging 4 or 6 packs. In practical use, you would only be parallel charging that many batteries on very rare occasions, perhaps once per season. Besides, most chargers out there don’t have enough ass to charge 6 pattern packs in parallel and be done before sundown anyway. However, you should not be relying on your charger as the only point in your routine to detect bad cells.</span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In my experience, folks with bad cells and puffy packs are doing a myriad of other no-no’s. The worst is taking their batteries home on a full charge and letting them sit all week or all winter. My soapbox finally broke down on that one and now I just smile and say “That’s too bad” and keep walking down the flight line. </span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ironically, the “straw that broke the camel’s back” for me was an H1B German Engineer who flies at our field asked me how I keep my packs from puffing up. Every time I said “storage charge at the end of the day”, he would reply “I don’t do that.” Then I said, “Yes, that’s why your batteries are all puffy and trashed.” To which he replied “Yes, I charge my batteries to 100% before taking them home.” . . . <Sigh> . . .</span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I now understand how VW got busted.</span><o:p></o:p></p><p class=ecxmsonormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=ecxmsonormal style='mso-outline-level:1'><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri","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>Vicente Bortone via NSRCA-discussion<br><b>Sent:</b> Thursday, October 8, 2015 13:16<br><b>To:</b> James Hiller <<a href="mailto:jnhiller@earthlink.net">jnhiller@earthlink.net</a>>; General pattern discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br><b>Subject:</b> Re: [NSRCA-discussion] 10s LiPo Charger Recommendation</span><o:p></o:p></p><p class=ecxmsonormal> <o:p></o:p></p><p class=ecxmsonormal>For some reason TP does not recommend parallel charging. Probably because it is difficult to keep track of each cell and values are averaged. Is this really an important factor? At this point I just following instructions. This factor could be important to decide what charger to buy.<o:p></o:p></p><div><p class=ecxmsonormal> <o:p></o:p></p></div><div><p class=ecxmsonormal>Vicente "Vince" Bortone<br><br>On Thursday, October 8, 2015, James Hiller via NSRCA-discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>> wrote:<o:p></o:p></p><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-top:5.0pt;margin-bottom:5.0pt'><p class=ecxmsonormal style='mso-outline-level:1'>Plug & play charge box from Progressive RC (see photo).<br>Parallel charging 5 flight packs in one session while having a couple cold ones!<br>Jim<br><br><br>-----Original Message-----<br>From: NSRCA-discussion [<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>] On Behalf Of Dr. Michael Harrison, DDS via NSRCA-discussion<br>Sent: Thursday, October 08, 2015 9:46 AM<br>To: 'Earl Haury'; 'General pattern discussion'<br>Subject: Re: [NSRCA-discussion] 10s LiPo Charger Recommendation<br><br>lol<br><br>-----Original Message-----<br>From: NSRCA-discussion [<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org">mailto:nsrca-discussion-bounces@lists.nsrca.org</a>] On Behalf Of Earl Haury via NSRCA-discussion<br>Sent: Thursday, October 08, 2015 8:26 AM<br>To: Budd Engineering; General pattern discussion<br>Subject: Re: [NSRCA-discussion] 10s LiPo Charger Recommendation<br><br>Jerry<br><br>Hard to beat the iChargers. The CellPros taught me that a fuse between the pack & charger is a good investment! No issues with 3010b iChargers (about<br>3000 charges over 5 years or so). They will report cell IR / voltage and charge a 10S pack at 2C with a 24v supply without breaking a sweat. The newer 4010 can handle 2x10S and displays data from both packs simultaneously. They don't meet your criteria of charging through the balance leads, but haven't really found that to an issue as the balancing system works fine. Can't really comment on service, haven't needed any (that should jinx me).<br><br>Earl<br><br>-----Original Message-----<br>From: Budd Engineering via NSRCA-discussion<br>Sent: Thursday, October 08, 2015 4:59 AM<br>To: List NSRCA-list<br>Subject: [NSRCA-discussion] 10s LiPo Charger Recommendation<br><br>Hi all, I m in need of some advice/suggestions for a new LiPo charger for 10s packs.<br><br>For the past several years I ve used CellPro-10S chargers with good results.<br>However recently one of my CellPro-10s' emitted the dreaded magic smoke when I connected a 10s pack for charging. This also happened at the Nats 3 years ago, fortunately Mike M. from F3AU was there with inventory and I was able to purchase a replacement charger and press on. However, after having a second one give up the ghost a few weeks ago (and after not many charge cycles - I don t fly very much), I m interested in exploring other options.<br><br><br>To try to add some focus to this here s my search constraints:<br><br>1. It must be able to charge each cell individually through the balance connector, and give me a relative readout of each cell s condition compared to the other 9 cells.<br><br>2. I m not interested in chargers that have separate balancers from the charger (e.g. like the TP1010C).<br><br>3. Reliability and value are important, as is ease of use.<br><br>4. Cost no more than a replacement CellPro 10XP (<$180), unless a single charger can charge two 10s packs simultaneously, then I d consider spending a bit more.<br><br>5. Customer service matters, if I can buy it through F3A Unlimited, that would be a PLUS.<br><br><br>With this in mind does anyone have a suggestion for what chargers I should<br>consider?<br><br><br>I don t get out much these days so it s difficult to see what everyone s<br>using that works well. So I really do appreciate everyone s help with this.<br><br>Thx, Jerry<br>_______________________________________________<br>NSRCA-discussion mailing list<br><a href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br><a href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br><br>_______________________________________________<br>NSRCA-discussion mailing list<br><a href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br><a href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><br><br>_______________________________________________<br>NSRCA-discussion mailing list<br><a href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br><a href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><o:p></o:p></p></blockquote></div><p class=ecxmsonormal><br><br>-- <br>Vicente "Vince" Bortone<o:p></o:p></p></div></blockquote><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=ecxmsonormal>_______________________________________________<br>NSRCA-discussion mailing list<br><a href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a><br><a href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" target="_blank">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><o:p></o:p></p></div></blockquote></div><p class=MsoNormal><br>_______________________________________________ NSRCA-discussion mailing list <a href="mailto:NSRCA-discussion@lists.nsrca.org">NSRCA-discussion@lists.nsrca.org</a> <a href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a><o:p></o:p></p></div></div></div></div></div></blockquote></div></div></body></html>