Sub C cells for 2002?

[Dan Egleton]

Hi All,

Just wondering if anyone has any thoughts as to what the best sub-c sized cells were going to be for 2002? Inparticular for 6 and 8 minute discharges (ie. Eco)

I've been using Powers 3000 GT through 2001 and have been please with them, except they don't seem to stay matched.

Orion have a funky graph on the latest Sanyo 3000s, but I tend to be sceptical about this sort of thing.

Anyone done any testing?

regards,
dan.

[Paul]

Hello Dan,

This is just a rumor but in Japan I hear that their running Sanyo 3000 Nicads, yep I said Nicads! Some pics of them were seen so who knows?

I'm trying to see if I can get a hold of a case of them through China.

Paul.

[JfromJAGs]

Paul, do you have a link to the pictures or the discussions? Thanks. I heard of a 2600-2800 NiCd through 2001, but have never seen anything.

Dan, concering Eco: GP will release a new GP3300 NiMH soon and the new Sanyo RC3000HV (blue shrink) are the cells with the highest voltage I've ever seen (up to 40A).

So, 8min: GP3300. 6min RC3000HV or GP3300.

Joerg

[Dan Egleton]

Thanks guys. I'll get hold of some Sanyo HV's and give them a try.

dan.

[Allan]

Dan,

The reports are that the sanyo300hv's are V V good. They beat the old gp's in to a cocked hat on first charge. They were on sale at Sandown.

Allan

[JfromJAGs]

Allan, they are different. It's not that easy.

Good GP3000's had the voltage of RC3000 but up to 3500mAh capacity. RC3000HV have a 250-300mV higher voltage (7cell pack @30A) but still 3000mAh. Well, I don't know what the GP3300 will look like.

I think it depends on the application.

Joerg

[Allan]

Joerg,

I never expected it to be that straight forward - just reporting on what happened - Same set up swap the GP's for Sanyo's and the boat was faster and did the time. It would seem that they support higher currents better than the GP's. is all.

Allan

[JfromJAGs]

Right, Allen. With HV your'll be definetly faster with the same equippment - but you should run shorter compared to GP's. You would need to run a bigger prop or a hotter motor with GP's. Or use them when your short on runtime.

They both have their applications.

Joerg

[Ian Williams]

Joerg, what cells did you use in your 80mph boat?

[JfromJAGs]

On the 80mph run I was using CP1700 NiCds from Sanyo, which will be released as RC1600 soon.

But that's a different story. We were talking about Eco before.

Joerg

[Ian Williams]

Hi Joerg, yes I know about the Eco cells, was just curious about the hydro

[Allan]

Joerg,

That's what was interesting the Sanyo's did not seem to have a reduced run time compared to the GP's

Allan

[JfromJAGs]

There were different batches of GP's around in 2001. Some were bad (around 3000mAh,low voltage), some were extreamly good (3500mAh+,good voltage).

From what I hear the latest batches have been preselected in the company => good average. I'm expecting GP to be strong in 2002. We'll see.

Another point is speed and runtime with an eco boat. Depending on the boat and the setup you might run faster and longer! When the resistance (wetted surface) changes, you'll might see this strange effect.

Joerg

[voepel]

Joerg,
Can you tell me what date codes to avoid or use for the GPs or how are they marked?

Thanks, Steve

Originally posted by JfromJAGs
There were different batches of GP's around in 2001. Some were bad (around 3000mAh,low voltage), some were extreamly good (3500mAh+,good voltage).

From what I hear the latest batches have been preselected in the company => good average. I'm expecting GP to be strong in 2002. We'll see.

Another point is speed and runtime with an eco boat. Depending on the boat and the setup you might run faster and longer! When the resistance (wetted surface) changes, you'll might see this strange effect.

Joerg

[popop]

Chances are Sanyo will stop selling CPs in their current from to R/C ... Their new packaging will allow Sanyo to sell them 30% more (i.e. colorful scheme !) ...

More seriously see following pix for illustration :

http://rcsaga.com/cp1300.jpg
http://rcsaga.com/cp1700.jpg

1700 are quite hard to verify, right now some retaillers name them "1600" despite of the Sanyo title ...


Bye

[Ian Williams]

The question is Joerg, at what current draw did those GP cells deliver 3.5 ampere/hours? I've never seen a NiMh cell that would perform like that at 30-35 amps.

[JfromJAGs]

1. I have seen at least 15 different kinds of codes on GP cells. And I don't mean codes. I mean how it was printed, size of the letters, lenght of the codes, braked around, position on the cell... I once had 2 packs of GT3000. There were no 2 cells with equal code.

The best cells I had so far had brakets around the numbers.

2. The GP's delivered 3500mAh+ at @22A. Eco standard current.

3. Sanyo stopped delivering CP1700 in Germany in last August or September. Just after they delivered the first batches. I had really trouble to get some before LA.

Here is a picture of what they will do next:

http://www.hopf-modelltechnik.de/images/akkus/rc2345gr1.jpg

RC cells = more money.

Joerg