You bet Jim, great cells. In competition, the packs are first heated to
~50C to realize their full potential. It is at these temperatures and
higher that they offer excellent voltage retention!
Jim Laurel wrote:
Yes, for sure NiMh cells generally have lower impedance. But we are
talking about the GP2200 here. I routinely draw around 70-95 amps from
these things in my 10 and 12-cell electrics. A TD plane, fitted with
DS368s will draw a max of what, 5-6 amps?
--Jim
On Mar 8, 2006, at 6:13 PM, Simon Van Leeuwen wrote:
Hi Jim,
The most important specification to consider is the cell impedence.
You might be surprised to discover that cell (larger) surface area in
those bigger NiMH cells still does not make up for lower impedence
within an even smaller NiCD cell.
Add a larger (similar) NiCD cell "and" the lower impendence it offers
and you can actually measure the available voltage difference at the
servo when it is really needed...
Jim Laurel wrote:
True enough, Simon. But if you use large enough NiMh cells, there
is more than enough ability to deliver the kinds of currents we
need. I have always thought it was silly to see people using 4-
cell AA or even AAA NiMh packs in big TD ships, then adding lead to
balance. I always try to get as close as possible to the CG I want
using batteries rather than lead. In the Pike Superior, for
example, I use 4-cell packs of GP2200. WIth a JR R770 up front and
maybe ~3/4 to 1 oz of lead taped to the side of the pack, you are
usually right on the CG. There is no current draw issue with those
GP2200 cells! ;-)
--Jim
On Mar 8, 2006, at 5:40 PM, Simon Van Leeuwen wrote:
In a TX, NiMH offers superior performance given the relatively low
current consumption. On the other hand, NiMH is inferior on the RX
side when current demands are high when compared to NiCD.
Arne Ansper wrote:
Hi!
Must get new battery for TX. Current one is down to 500mAh (from
750mAh) and lasts only for 2.5 hours. I can get 1100 mAh NiCd or
1650 mAh NiMH (both Sanyo) at the same price. Which one is better
for TX?
Arne
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