Charging concerns/questions with NMP Lithium Ion batteries

[Del Rykert]

Dean.
    What a MOUTHFUL and stated exactly as I believe on all points. We
shouldn't be super mad at our volunteers who sometimes try to serve us...
LAST sentence intentionally said TIC.

                         del
               NSRCA - 473

----- Original Message ----- 
From: "Dean Pappas" <d.pappas at kodeos.com>
To: <discussion at nsrca.org>
Sent: Monday, May 10, 2004 2:28 PM
Subject: RE: Charging concerns/questions with NMP Lithium Ion batteries


Hi Dave,
Maybe I shouldn't have stayed silent so long ... I don't have to go back to
MiCads, as I never left! I still run my SR NiCads, using a Sirius charger to
top-up a 5-cell 500mAH pack after each flight. It takes just about 20
minutes, and the whole thing weighs under 3.5 ounces. Since the Sirius
doesn't peak, I don't even use a regulator. My Futaba digitals haven't
protested yet! Of course, the old engine test-bed Ariel uses nickel and
cadmium as noseweight, so that ship has a 1000mAH pack.

Oh yeah ... I don't get anything for free from Larry Sribnik, and I like the
man 'cause he sells me good stuff that hasn't let me down. Back in the early
Stone, Age NiCads had problems ... now they are close to bullet-proof.
According to Larry, someday other technologies will get that robust, but for
now it hasn't happened. By the way, he is actively working on both nickel
metal-hydride and litium battery technologies that he would be willing to
sell, and I am waiting ... patiently.

You know ... there are just too few of us to ever be mad at each other. I do
think that the sponsorship culture has run amok, though.

Regards to all
Dean P.





-----Original Message-----
From: David Harmon [mailto:K6XYZ at comcast.net]
Sent: Friday, May 07, 2004 9:55 PM
To: discussion at nsrca.org
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 klipped for reposting...  **


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