Charging concerns/questions with NMP Lithium Ion batteries

Sat May 8 00:44:17 AKDT 2004

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don't want to give the world the impression that Pattern Flyers are from the
"wrong side of the tracks", now do we? In the future, if someone offends you
(intended or otherwise) start counting backwards from 99, and when you get
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Have a nice day,
Tom Weedon
List Moderator

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Mike Hester
Sent: Friday, May 07, 2004 10:58 PM
To: discussion at nsrca.org
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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