Charging concerns/questions with NMP Lithium Ion batteries

[Wayne Galligan]

You guys crack me up....  now go kiss and make up...errr or go fly.

Wayno....

----- Original Message ----- 
From: "Mike Hester" <kerlock at comcast.net>
To: <discussion at nsrca.org>
Sent: Friday, May 07, 2004 9:57 PM
Subject: Re: Charging concerns/questions with NMP Lithium Ion batteries


> Hey bud...if you'd like, I'll give you detailed instructions of where you
> can shove that chicken little comment. I'll give you a hint: mine never
sees
> the light of day, but yours might.
>
> If you have a problem with me, take it off line kerlock at comcast.net as I'm
> sure others don't care to have to delete it.
>
> You wanted to push my buttons? Congradulations bucko, you nailed mine.
>
> For the record, I asked if Troy was sponsored by Central because I really
> don't know if he is...I know he's sponsored by JR and YS, but the way he's
> going into detail about Central and NMP, I began to guess. I don't give a
> rat's furry backside if he's sponsored or not.
>
> But until your brilliant post, almost all of the opinions on the positive
> side of lithium batteries (the ones in strong defense) have been from
either
> sponsored pilots, or those with a vested interest in some way. But at
least
> they didn't have the utter GALL to talk smack to someone giving a warning
> about the POSSIBLE dangers of this product....unlike you, professor "me
> too".
>
> You're really a work. What in the hell do I possibly have to gain by
telling
> the truth? Certainly not financial, it I certainly am not making any
friends
> now am I? So gee Einstien, whatever could be the reason?
>
> Buh bye.
>
> -Mikey
>
> ----- Original Message ----- 
> From: "David Harmon" <K6XYZ at comcast.net>
> To: <discussion at nsrca.org>
> Sent: Friday, May 07, 2004 10:37 PM
> Subject: RE: Charging concerns/questions with NMP Lithium Ion batteries
>
>
> > Good night Chicken...ur...ahhh....Mikeyyyy
> > Don't forget to charge over night.
> >
> > Regards
> >
> > Dave Harmon
> > NSRCA 586
> > K6XYZ[at]comcast[dot]net
> > Torrance, Ca.
> >
> > -----Original Message-----
> > From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
> > On Behalf Of Mike Hester
> > Sent: Friday, May 07, 2004 7:22 PM
> > To: discussion at nsrca.org
> > Subject: Re: Charging concerns/questions with NMP Lithium Ion batteries
> >
> > Aww did I make you angwy?
> >
> > Nobody took a "swipe" at Troy. I asked a simple question. Get over your
> > fool
> > self.
> >
> > You sir are just the type of moron who could very well get careless and
> > roast himself. More power to you.
> >
> > Have fun, sleep tight =)
> >
> > -Mikey
> >
> > ----- Original Message ----- 
> > From: "David Harmon" <K6XYZ at comcast.net>
> > To: <discussion at nsrca.org>
> > Sent: Friday, May 07, 2004 9:54 PM
> > Subject: FW: Charging concerns/questions with NMP Lithium Ion batteries
> >
> >
> > I don't hear anyone recommending going back to nicads..
> > Just use the proper charger properly and set it correctly and Chicken
> > Little will stop crowing.
> > I have been using the SR 1000 5 cell packs and they are great. They are
> > 1000mah and I get
> > 5 flights with a similar setup as you describe.
> > This pack weighs 5 oz and I use the Jaccio regulator too.
> > That is 2.5oz more than someone else said the NMP weighs but so what?
> > I use both types of batteries and am going to change completely to NMP
> > Ni-Ion as soon as the
> > rest of the Nicads go bad...and I am gonna BUY them from Central Hobby
> > as I am not sponsored by
> > them..if anything WE sponsor CH and the other fine businesses as well..I
> > can think of several.
> > It buggsss me because somebody took a swipe at Troy because he is
> > sponsored..he SHOULD be sponsored!
> >
> > Regards
> >
> > Dave Harmon
> > NSRCA 586
> > K6XYZ[at]comcast[dot]net
> > Torrance, Ca.
> > -----Original Message-----
> > From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]
> > On Behalf Of Ed Deaver
> > Sent: Friday, May 07, 2004 6:34 PM
> > To: discussion at nsrca.org
> > Subject: Re: Charging concerns/questions with NMP Lithium Ion batteries
> >
> > OK, Ive had Duralite and subsequently Powerflites for about 5 years
> > now. Because of the fire hazard, everyone is recommending going back to
> > reg batteries or NMhd(which my charges probably won't support)
> >
> > So for 3 digital, 1 4721 and a mini throttle servo, how many mah should
> > I look at buying in old style batteries? I would only go with 5 cell
> > pack.
> >
> > Thanx
> >
> > ed
> >
> > Keith Black <tkeithb at comcast.net> wrote:
> > Thanks for your reply Jim.
> >
> > I do like design of the NMP charger and the way it shows how much
> > current is being feed to the battery. This is clearly an excellent
> > design feature.
> >
> > What I gather from your response is it is "possible" for a cell to be
> > charged beyond the safe limit if another cell is either out of balance
> > or defective. Also, I understand your point that one may be able to spot
> > a bad cell after becoming familiar with the charger.
> >
> > As it relates to the cells being unbalanced, will lithium batteries
> > equalized each other via a "trickle" as is the case with NiCad
> > batteries?
> >
> > Jim, I really appreciate your always candid responses and willingness to
> > assist others on the list.
> >
> > Thanks,
> > Keith
> > ----- Original Message ----- 
> > From: JOddino
> > To: discussion at nsrca.org
> > Sent: Friday, May 07, 2004 10:30 AM
> > Subject: Re: Charging concerns/questions with NMP Lithium Ion batteries
> >
> > Hi Kieth,
> > I believe the NMP solves most of the problems we have all read about.
> > 1) it is the right type of charger for Li-Ions and is dedicated to that
> > chemistry by limiting the current and the voltage. 2) it is set for
> > two-cell packs and that cannot be changed by the operator or on its own.
> > 3) it limits the current to less than the 1C rate (for 2000 mAh packs).
> > Probably its best feature vs. the other chargers is the meter that tells
> > the operator what is going on. After you use it a few times you will be
> > able to predict the current at the beginning and during the charge cycle
> > depending on how many flights you had. If something is wrong, like a
> > cell way out of wack, it will give you an indication. Of course it
> > tells you when the pack is charged and if for some reason it was taking
> > too long you would figure it out. In other words you will learn what is
> > normal proper charge current vs. time and could spot an unbalanced
> > pack. It cannot assure you a cell will not be overcharged if the cells
> > are not matched but I believe you would spot it.
> > I've been using it for over a year and always charge the packs in the
> > plane. The total charge time is relatively short so you can monitor it,
> > but I have left them plugged in over night.
> > I have only seen one pack (a Duralite which was in a plane I bought)
> > with a slight unbalance. It was a 2S2P configuration and I don't have
> > much experience with that configuration. I have never seen a simple 2
> > cells in series pack unbalanced.
> > Where you really need to worry about this is in long strings like those
> > used in electric flight. I talked to Fred Marks (FMA) about bringing
> > out each node so each cell could be checked and charged individually if
> > required. He said they plan to do that in the future.
> > In the mean time, I believe one could stick a pin through the heat
> > shrink to check the cell balance. I'll try that today and get back to
> > the list.
> > Regards, Jim
> >
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