[NSRCA-discussion] AAA NimH batterys

[Steven Maxwell]

 That's good to know Dean as I'm not going to use a switch or other wiring
in the electric just plug straight in to the receiver because having change
out big batteries anyhow.
 Steve Maxwell


> [Original Message]
> From: Dean Pappas <d.pappas at kodeos.com>
> To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
> Date: 1/26/2006 10:55:23 AM
> Subject: Re: [NSRCA-discussion] AAA NimH batterys
>
> Hello Bob!
> You nailed it right on the head! The commbination of cell resistance and
wiring/switch harness is what gets us. In general, NimH batteries have
higher resistances than NiCads, but lower than Li-ion.
>
> Even so, the batteries are only the source of about half of the voltage
droop under load. The other half is wiring/switches. I use a battery pack
that has double wires/plugs and either twin stock switches into two sets of
pins on the RX, or one beefy switch with double wires in and out. As long
as the leads are short, this is reasonably light. I use a 5-cell NimH pack
from SR batteries that has literally half the cell resistance of any
low-cost NimH you get elsewhere, that SR puts the double wires on, at my
request. I use no regulator. The 5-cell 900 mAH pack is 3.7 oz, and the 500
is something like 2-1/2 oz. If you look at his site <srbatteries.com> and
look up the resistances of the "H" series cells, and compare to others ...
oh my, others generally won't even list their NimH cell resistances!
> hint-hint.
>
> P. S. I have no interest in, or relationship with SR, I changed to them
years ago, and the only battery problem I have ever had, since '84 was when
I flew too many flights on a small battery. That was my stinkin' fault.
> Dean
>
> Dean Pappas
> Sr. Design Engineer
> Kodeos Communications
> 111 Corporate Blvd.
> South Plainfield, N.J. 07080
> (908) 222-7817 phone
> (908) 222-2392 fax
> d.pappas at kodeos.com
>
>
> -----Original Message-----
> From: nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Bob Kane
> Sent: Thursday, January 26, 2006 10:13 AM
> To: NSRCA Mailing List
> Subject: Re: [NSRCA-discussion] AAA NimH batterys
>
>
> Maybe somebody with direct experience will chime in,
> but I would be concerned about the higher impedence of
> AAA cells compared to AA or A cells. The high
> impedance will cause the voltage output to drop during
> high current peaks and may manifest itself as sluggish
> performance.
>
>
> --- Ed Miller <edbon85 at charter.net> wrote:
>
> > Is anyone using AAA NimH batteries for a RX pack ??.
> > I am looking at 
> > Batteries America ( EHYOST ) and they seem to have
> > AAA NimH's in 720, 800 
> > and 900mah ratings. I currently use their 2/3A 5
> > cell NimH pack at 1100mah 
> > and a weight of 3.85 ounces complete with the long
> > lead I have on the pack. 
> > Going to their AAA 5 cell pack looks like I can save
> > about an ounce or so. 
> > Mah isn't an issue, I can get in excess of 7 to 8
> > flights on the 1100mah 
> > pack I use now before charging so going to 900mah
> > shouldn't be a big hit. 
> > Don't suggest Lithium anything as lighter, want to
> > continue to use my Alpha 
> > 4 charger and am not convinced those new batteries
> > are safe.
> > Ed M. 
> > _______________________________________________
> > NSRCA-discussion mailing list
> > NSRCA-discussion at lists.nsrca.org
> >
> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
> > 
>
>
> Bob Kane
> getterflash at yahoo.com
>
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