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e-Electric Batteries & Chargers > Any opinions about using NiMH instead of NiCd?
 
 
Jos
Heliman
Location: Veghel, The Netherlands, Europe

Hello,

What is your opinion about using NiMH cells instead of NiCad cells? I found out that some people have the opinion that NiMH cells cannot deliver high output for a long time so they are useless for Heavy Duty RC.

Any comments?

Jos
06-29-2003 Over year old.
 
 
FinnDave
Elite Veteran
Location: Kouvola, Finland

I believe NiMH are more sensitive to vibration and low temperatures. I use them in the Tx, but not the heli.

David S., Kouvola, Finland
06-29-2003 Over year old.
HOMEPAGE  
 
 
daggit
Elite Veteran
Location: Waseca MN

I think you get a little more capacity from smaller cells but.... in my experience you have to take a little more care in charging them.

I've had a couple times where they "false peaked" on the charger, indicating that they were ready to go but really hadn't charged hardly at all. A good charger and "cycling" is key for using Nimh batteries.
06-29-2003 Over year old.
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twguns
Senior Heliman
Location: Indianapolis, IN

Well, I can tell you from personal experiance that the NiMh batteries are just super in E-Helis... I fly a Joker with both Panasonic Ultra Metals and GP- 3300's and both cells work just great in helis...

As far as vibration, that's one of the major high points in e-helis... There is none!!! No piston trying to beat it's way out of the engine case... If you set up your machine well (and that is ANY machine) there will be no vibrations, excepting for the engine, and E-helis use a motor...

My Joker as well as my VE are super smooth (unless I get lazy) and that's on me...

NiMh = big thumbs up!!!

bigTim
06-29-2003 Over year old.
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spincycl
Veteran
Location: Marietta, GA

TwGuns, very interesting...

I have a Logo20 using 24 cells and an Aveox 46/40/3. The running current is around the 50 amp area.

So, if you get away with runnin NiMh in a Joker, that may work in my Logo24.

Are you running any particular hydrides? 2600 mAh? 3300's? Are some more durable than others?
06-30-2003 Over year old.
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BIGRCR
Veteran
Location: Easley, South Carolina

James,

The 3300 NiMh GP cells work very well in the Logo's.

Later,

BIGRCR- John Garst
06-30-2003 Over year old.
 
 
Tom Carne
Veteran
Location: Western Australia

From my vast experience, NOT.
NiMh don't suffer from memmory effect like NiCad does.
3300 NiMh is a bigger pack than the 2400 NiCad which has to be a good thing with the way gyro's draw the current.

No rain on flying days:)
06-30-2003 Over year old.
 
 
twguns
Senior Heliman
Location: Indianapolis, IN

The two best cells that I have found are the Panasonic Ultra Metal 3000's and the Gold Peak GP 3300's... The Ultra Metals are 300 less ma capacity but I consistantly get 3200ma's in a charge with an Orbit Pro... They are also 6 grams lighter than the other sub-C batts and in a 32 cell machine that's like 6 ounces...

Tha GP's are awesome batteries but you should have or get them zapped... Most are sold this way for .25 to .50 more in cost but well worth it... Their internal resistance (the most important thing from the performance standpoint in our batteries) is very low when zapped... The Ultra Metals IR is 4.0 which is very good... The IR of say CP-2400 that many are flying is 5.0... the lower the IR, the more performance... The zapped GP's can be as low as 2.0...

BTW, the GP's weigh the same as most other sub-c batteries at 60g...

bigTim
06-30-2003 Over year old.
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sjslhill
Heliman
Location: Kentucky

We have them

GP 3300 cells.

thanks
Steve
www.battlepack.com
07-02-2003 Over year old.
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BigD
Senior Heliman
Location: Dallas, GA

I was looking at NiMH packs for my new Combat Wing but I was told they wouldn't be good to use with my motor, either a Wattage Cobalt 400 or an Aveox 27/13/3, was I told incorrectly? I know nothing about batteries but I do know that I want the maximum amount of time in the air

What should I buy?
07-02-2003 Over year old.
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sjslhill
Heliman
Location: Kentucky

If i am correct......

This motor requires as much as 15 amps correct? What are you using in the NICAD line? I can comment on a replacment. There are several great NIMH cells now.

thanks
Steve
07-03-2003 Over year old.
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JoeR
Senior Heliman
Location: now in western NY state

The Sanyo 2600 NiMH cells are suppose to be the best subC cells right now. Better then the 2400 Nicad, better then the 3000+ NiMH. They hold their voltage underload better and their capacity under load is better also.

Big D- if you are pulling around 15 amps then the KAN 950 NiMH are suppose to be very good cells for your application.

Best to check out ezone at rcgroups for more electric info.
07-05-2003 Over year old.
 
 
sjslhill
Heliman
Location: Kentucky

I was thinking that....

I was thinking the same but needed more info.....
07-05-2003 Over year old.
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twguns
Senior Heliman
Location: Indianapolis, IN

That 2600 ploy about being the best cell to use is IMO way off and designed to sell cells (pardon the pun)...

The Sanyo 2600's are heavier than and has a higher IR than either the Panasonic UltraMetal 3000's or the GP 3300's... The weight and internal resistance are the most important factors in cell performance, not necessarly in that order...

Basically the 2600's are slightly above average at best...

Let me put it this way do you want a battery that is harder to get the current out of and is heavier to boot, or, do you want a cell that has more capacity, lighter weight AND is easier to get the energy out of???

AND you have two choices for the better cell...

bigTim
07-05-2003 Over year old.
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Eddi E. aus G.
Senior Heliman
Location: Gerlingen. Germany.

A NiCD experience:

My Sanyo RC-2000 take 2350 Ah from the charger,
my Sanyo RC-2400 take 2450 Ah from the charger,

they last almost the same time (10:30 to 11 mins in the Silence, easy flying).

I use a Robbe MaxAmp, charge at 5 Amps, for the last few minutes current drops to 4 Amps as the voltage peaks.

I think if you get selected and matched cells you will get the almost the same performance out of (sometimes significantly cheaper) lower capacity cells. That imho also applies to the NiMHs, so watch out where you're buying from. Sometimes I suspect Sanyo and others only manufacture one kind of cells, and label them depending on their quality...

Born to fly. Forced to work.
07-05-2003 Over year old.
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sjslhill
Heliman
Location: Kentucky

interesting

"That 2600 ploy about being the best cell to use is IMO way off and designed to sell cells (pardon the pun)... "

Everyone has an opinion. Since we sell all types of cells and have testing data, I will assume that your not talking about me.

Foam positive electrode cells (3300) are not good for applications above 40-45 constant current. The sintered 2600 cell is good.

http://www.battlepack.com/images/2600_60A.jpg

This application of 15 amps however looks like a much smaller cell is needed, thus the KAN950.
07-05-2003 Over year old.
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twguns
Senior Heliman
Location: Indianapolis, IN

Nope, didn't even realise that you sold "cells"... as you said just my opinion, all be it an educated one... I think the math tells the story that Sanyo has bred the "2600 myth" since their larger NiMh cells are kind of "dumpy" (large with little performance) compared to the Panasonic and Gold Peak cells...

They have lost their grip on the marketplace and the 2600 (which as Eddi suggested MIGHT be Sanyo's old 3000 cell "re-tubed") is their answer to try to gain back their place in the market... Thinking about it the S-3000 cells kinda' dissappeared around the time the 2600's showed up... Hopefully, educated users, like us E-heli people will be able to choose the correct cells for our "birds" and everyone (but maybe Sanyo) will be happy...

bigTim
07-05-2003 Over year old.
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sjslhill
Heliman
Location: Kentucky

Well....

Sanyo has a 3300 NIMH cell but it's not as good as the GP3300 cell.

The 2600 cell is a powertool cell that people has chosen to use in high current applications.


thanks,
Steve
07-05-2003 Over year old.
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RCKing
Heliman
Location: Lawton OK.

WTB 3300gp 7cellflat packs

I need to find some 7 cell 3300 flat packs for my corona but havent been able to find packs only loose cells. Anyone know of a resonable place to find them. Thanks RCKing
07-31-2003 Over year old.
 
 
Roi Ballard
Heliman
Location: Bishop Calif

NiMH bad for helis.

I was told by HeliProz that NiMH batteries are bad in helis because of the inheirant vibrations a heli produces. What does vibration do to a battery ? Whats loose ?

Any one else know about this problem ?
Shoul I remove them from my helis ?

Roi Ballard

Flying Is For The Birds.......Tweet, Tweet, Tweet !
11-06-2003 Over year old.
 
 
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e-Electric Batteries & Chargers > Any opinions about using NiMH instead of NiCd?
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