Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Simon Van Leeuwen
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 abo

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Jim Laurel
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, Si

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Simon Van Leeuwen
They (NiCD's) are across the whole operating range... [EMAIL PROTECTED] wrote: There is no current draw issue with those GP2200 cells! ;-) how do those Nimh's hold up in cold temps. compared to Nicads ? from my experience the Nicads are better in cold. dh --Jim On Mar 8, 2006, at 5:4

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Simon Van Leeuwen
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 lo

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread jrmaclean
Arne, Consider that the transmitter has very little pulse load requirements, that is, the current drain is relatively constant so cell resistance is a minor consideration. Therefore, the NiMH battery with its superior capacity at moderate current is a better choice. The only downside to NiMH

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread davidhauch
There is no current draw issue with those GP2200 cells! ;-) how do those Nimh's hold up in cold temps. compared to Nicads ? from my experience the Nicads are better in cold. dh --Jim On Mar 8, 2006, at 5:40 PM, Simon Van Leeuwen wrote: In a TX, NiMH offers superior performance given the

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Jim Laurel
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 ge

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Simon Van Leeuwen
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) a

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Jim Laurel
Arne, I would suggest replacing your OEM NiCd pack with a higher capacity NiMh pack. I did it a few years ago and have been delighted. I can just about do a complete 2-day contest with my JR 9303 on a single charge. I am using the 1650mAh Sanyo pack built by Steve Anthony at hangtimes.c

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Bill Swingle
What Doug said. :-) Bill Swingle Janesville, CA RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off. Email sent from

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Doug McLaren
On Thu, Mar 09, 2006 at 02:07:34AM +0200, Arne Ansper wrote: | On Wed, 8 Mar 2006, Bill Swingle wrote: | | >Each will work fine for the TX. | >How will you charge it? | | I have Reflex charger that does peak prediction (same chip that is inside | Sirius chargers), but it will only output 650mA

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread George Joy
Arne, The NiCd will have a longer life span, and the NiMH needs a GOOD quality charger designed with NiMH features. George The Sirius Charger guy At 01:45 AM 3/9/2006 +0200, Arne Ansper wrote: Hi! Must get new battery for TX. Current one is down to 500mAh (from 750mAh) and lasts only

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Doug McLaren
On Thu, Mar 09, 2006 at 01:45:08AM +0200, Arne Ansper wrote: | 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? The TX doesn't really ca

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Arne Ansper
On Wed, 8 Mar 2006, Bill Swingle wrote: Each will work fine for the TX. How will you charge it? I have Reflex charger that does peak prediction (same chip that is inside Sirius chargers), but it will only output 650mA max. I've heard that NiMH cells do not like too low charging current and

Re: [RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Bill Swingle
Each will work fine for the TX. How will you charge it? Do you tend to abbuse your batteries? Bill Swingle Janesville, CA RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe mess

[RCSE] TX battery - NiCd or NiMH?

2006-03-08 Thread Arne Ansper
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 RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "