[NSRCA-discussion] FW: 10s LiPo Charger Recommendation

Ed Alt ed_alt at hotmail.com
Thu Oct 8 11:54:44 AKDT 2015 

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?

Ed

> On Oct 8, 2015, at 3:09 PM, Keith Hoard via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
> 
>  
> 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 . . . “
> .
> 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. 
>  
> (steps up on soapbox) . . .
>  
> **I HAVE ACTUALLY SEEN IT WITH MY OWN EYES AND CONFIRMED IT WITH FURTHER TESTS**
> **PLEASE DON’T KEEP REFERRING ME BACK TO “THE INTERNET”**
> **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**
>  
> OK, with that statement out of the way . . . . (steps down off soapbox) . . . .
>  
> 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.
>  
> 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. 
>  
> 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> . . .
>  
> I now understand how VW got busted.
>  
> From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Vicente Bortone via NSRCA-discussion
> Sent: Thursday, October 8, 2015 13:16
> To: James Hiller <jnhiller at earthlink.net>; General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Subject: Re: [NSRCA-discussion] 10s LiPo Charger Recommendation
>  
> 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.
>  
> Vicente "Vince" Bortone
> 
> On Thursday, October 8, 2015, James Hiller via NSRCA-discussion <nsrca-discussion at lists.nsrca.org> wrote:
> Plug & play charge box from Progressive RC (see photo).
> Parallel charging 5 flight packs in one session while having a couple cold ones!
> Jim
> 
> 
> -----Original Message-----
> From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Dr. Michael Harrison, DDS via NSRCA-discussion
> Sent: Thursday, October 08, 2015 9:46 AM
> To: 'Earl Haury'; 'General pattern discussion'
> Subject: Re: [NSRCA-discussion] 10s LiPo Charger Recommendation
> 
> lol
> 
> -----Original Message-----
> From: NSRCA-discussion [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Earl Haury via NSRCA-discussion
> Sent: Thursday, October 08, 2015 8:26 AM
> To: Budd Engineering; General pattern discussion
> Subject: Re: [NSRCA-discussion] 10s LiPo Charger Recommendation
> 
> Jerry
> 
> 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
> 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).
> 
> Earl
> 
> -----Original Message-----
> From: Budd Engineering via NSRCA-discussion
> Sent: Thursday, October 08, 2015 4:59 AM
> To: List NSRCA-list
> Subject: [NSRCA-discussion] 10s LiPo Charger Recommendation
> 
> Hi all, I m in need of some advice/suggestions for a new LiPo charger for 10s packs.
> 
> For the past several years I ve used CellPro-10S chargers with good results.
> 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.
> 
> 
> To try to add some focus to this here s my search constraints:
> 
> 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.
> 
> 2.  I m not interested in chargers that have separate balancers from the charger (e.g. like the TP1010C).
> 
> 3.  Reliability and value are important, as is ease of use.
> 
> 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.
> 
> 5.  Customer service matters, if I can buy it through F3A Unlimited, that would be a PLUS.
> 
> 
> With this in mind does anyone have a suggestion for what chargers I should
> consider?
> 
> 
> I don t get out much these days so it s difficult to see what everyone s
> using that works well.  So I really do appreciate everyone s help with this.
> 
> Thx, Jerry
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> 
> -- 
> Vicente "Vince" Bortone
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