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E-flite . Fast Lad Performance . Ace Hobby

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Main Discussion > IS Nimh 2700 any good
 
 
aashu
Key Veteran
Location: Garden State , NJ

My venture lasts only 2 flights on a JR 1100 Mah NiCD before I feel charging it . Was wondering if 2700 4 cell Nimh good for this application ? Would like to hear from flyers who are using it

Thanks

Proudly Flying in NJ, USA
10-03-2002 Over year old.
 
 
sharam
Elite Veteran
Location: Northern California

I have one installed on my Fury Extreme and it seems to work just fine.

Driving 4 X 9252 servos, a 601/9251, and a GV-1 governor, I fly four tanks and still have the lowest green LED lit on the Voltwatch. I would guess I could get six to seven safe flights out of the 2700 NimH pack.

I am not a heavy 3D flier though. I would imagine if you are doing heavy duty 3D, it might last maybe five or six sessions - just a guess.
10-03-2002 Over year old.
 
 
Stet
Elite Veteran
Location: Long Beach CA

I have one that is nearly new for sale, $12 shipped. I got it in a used (2 flights) heli and preferNiCD. It is Expert brand.
10-03-2002 Over year old.
 
 
MooneyDriver
Veteran
Location: Kent, Ohio

Jury is out...

I've used one in my Miniature XL .46 all year. I've never had any problems with it. I easilly get 5 flights and I charge it at 1C (2700mah). That heli has 9404's in it.

I also put NiMH's (1650mah) in my transmitter. It more than doubled the number of flights over an 1100mah Nicad pack!

I couldn't use them in my Fury because they are too light! Nicads (2400mah) provide perfect balance.

The some claim they can't stand up to the current drain of an all digital machine, so you won't find too many top 3D pilots using them.

-Neil

Hey man, why does my lipo get bigger every time I charge it?
10-03-2002 Over year old.
 
 
raybee
Heliman
Location: Sacramento, CA

My Fury setup is very similar to SHARAM's. I am running all digital servos - 3 each 9250 on swash, & 2 each 9253 on throttle & tail. I also have the synth receiver, GV-1 & GY502. I have carefully noted that I use up about 400 MaH per flight. I am using the Sanyo 2700 NiMH pack and love the capacity in this lightweight package. You do the math and determine your margin of safety in how many flights you want to go before a recharge is in order. I fly 4 flights max.

Since the capabilities of a NiMH pack are such that its voltage will sag more so than NiCd in any given current peek under load (higher internal resistance), I turned off all failsafes and monitor my voltwatch carefully. I also log how much time I fly vs. how much my SuperNova 250S recharges the pack and have a very good feel of the health of my battery packs.

Never had a problem yet. FYI... the Simprop charger is a knock off of the SuperNova 250S and only works properly in Auto Mode and selects a painfully slow 300 to 500 ma rate in both charge and discharge modes. Manual Mode either terminates prematurely or Errors out. I don't know if Simprop has corrected this. The RC-Dymond product looks promising for NiMH packs.

Like MooneyDriver the lightweight pack is a bit of a problem when balancing your heli. I was toying with the idea of running two 2700 NiMH packs. One on the 9250's on the swash plate and the other on the throttle and tail servos and electronics. This would provide more weight to balance the helicopter, add bunches of spare electrons under the hood, reduce the instantaneous peek load, and unfortunately add more to the parts count of items to potentially fail.

Maybe some day I'll fiddle with it.
10-03-2002 Over year old.
 
 
MooneyDriver
Veteran
Location: Kent, Ohio

Charger...

I charge the battery with a Dymond Super Turbo. It doesn't false-peak at all...

I had the same thoughts about using a pair of 2700mah packs in my Fury. The wiring wouldn't be that big of a deal. I think the hardest part would be balancing the current load between the batteries. From my point of view, the only downside is that, you'd need a second charger.

-Neil

Hey man, why does my lipo get bigger every time I charge it?
10-03-2002 Over year old.
 
 
JCadwell
Key Veteran
Location: Richland WA/ Morro Bay, CA

I use the Sirius for my 2700 and 3000 NIMH packs. Works great. No frills, no nonsense, plug it in till it blinks. They make a twin outlet RX charger, so you can charge two reciever packs at the same time.

Thanks, John Cadwell
10-03-2002 Over year old.
 
 
Dragon2115
Key Veteran
Location: New England

Read this thread and decide for yourself.
10-03-2002 Over year old.
 
 
Secret Squirrel
Key Veteran
Location: New Zealander living in Melbourne, Australia

Does anyone know if the Robbe Infinity II charger will charge Nimh batteries?

BTW: I have got 13 flights on my 2700mah on my CS. That's 3 x 9252's, GY601 + 9251, plus Hitec throttle servo.

13 was the absolute max though! I'd never do that again! It wouldn't have done one more flight!

Si

-------------
Simon Lockington
10-03-2002 Over year old.
HOMEPAGE  
 
 
clueless29
Heliman
Location: Ypsilanti Township,MI

Where is everyone buying these 2700 batteries? Well let me rephraze the question who has the best price and what brand do you all recommend?
10-03-2002 Over year old.
HOMEPAGE  
 
 
sluggo
Elite Veteran
Location: Kitchener Ont

"the Simprop charger is a knock off of the SuperNova 250S"

Sorry to tell you this but your super nova is a simprop charger that has been distributed in north america by fma. Fma puts there own logo on it and calls it super nova. Simprop is the german company that makes them all. Also they have the same software right down to the charge and discharge amp.

I have been running the expert 2700 nimh pack for two years now with no prob, I have been charging it on my simprop (aka supernova) charger just fine for the last year.

With 2 9252's on cyclics, 9151 on pitch, GV-1 with 9253 on throttle and 601/9251 I am getting a easy 5 flights with about 300mah a flight.

Also I fast charge it at 2amps almost every time I charge it. No I do not charge the battery through the switch, I hard soidered another conection with a deans conection to the battery.

Chris
10-03-2002 Over year old.
HOMEPAGE  
 
 
aashu
Key Veteran
Location: Garden State , NJ

That is a lot of response !

Thanks guys !

Set if it is atleast 2500mah I will buy it for 12 shipped

Proudly Flying in NJ, USA
10-03-2002 Over year old.
 
 
a3holerman
Senior Heliman
Location: Cape Cod

Yes there has been a lot of discussion on the use of nimh packs in a heli. I have been using them for about 6 months now and must say they are great..........well sorta. I have had one pack ,after 3 months use, not take a charge properly. It only holds about 700mah (its a 2700mah pack) You must precondiition a pack by charging it at c/10 or less.
Take the rating on the pack multiply by 1.4 and devide by the charge mah. IE: 1000mah pack x 1.4 =1400 / 50mah(wall charger)=28 hours.

My bad pack was not charged properly at the start I think so am trickle recharging to see if that helps. I use the Dymond super pro and it is wonderfull.


Tom
10-04-2002 Over year old.
 
 
raybee
Heliman
Location: Sacramento, CA

HeliHut has a good price on the 2700 MaH HiMH packs for around $25 or so. Cheaper anywhere else guys???

FYI...
An FMA Direct Customer Service Rep is who told me that the Simprop was a knock off of their SuperNova 250S. I don't know what else to say, but that's what they told me. The products appear to be identical, or at least pretty darn close, other than the silk screen on the outside of the package and how they do or don't do NiMH batteries.

Our club members have about 4 of the Simprops - none will do NiMH correctly in Manual Mode. We have about 5 SuperNova 250S's between us and all report great results with NiMH.

I think I'll pick up an RC-Dymond Super Pro too. I've heard a lot of good things about it. Anybody try their optional temp probe?
10-04-2002 Over year old.
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

( http://members.aol.com/davthacker/r...rcbatteries.htm) Radical RC Battery has them for $22. The good Sanyo cells. Add a couple bucks for connector.
10-04-2002 Over year old.
 
 
sluggo
Elite Veteran
Location: Kitchener Ont

The nova and the simprop will only charge nimh in manual mode. Automatic mode is for nicads only. At our club there is about 10 novas and 6 simprops other then the silk screen on the out side of the chargers they are the same.

Maybe the guys at your feild have the older style and that is why they do not have the nimh charger software. Anyway the simprpop is not the nock off and the nova is nothing more then a simprop with fma silk screen on it.

Chris
10-04-2002 Over year old.
HOMEPAGE  
 
 
David B
Heliman
Location: Warren, New Jersey

According to FMA customer service, they are coming out with an updated version of the super nova. Anybody know what the changes are?
10-04-2002 Over year old.
 
 
MooneyDriver
Veteran
Location: Kent, Ohio

Check out this charger!!!

http://www2.towerhobbies.com/cgi-bi...?Q=1&I=GPMM3150

Hey man, why does my lipo get bigger every time I charge it?
10-04-2002 Over year old.
 
 
MJA
Key Veteran
Location: UK

Simon,
I have charged Nimh's with the Robbe Infinity II,seems to work ok though i did have some early false peak detects with my tx 1500 packs but i think that was because i hadn't by-passed the diode in one of my 9Z packs at the field one day.The Infinity has two settings "normal" and "sensitive" but doesn't have any software menu's for specifying between Nicad or Nimh's.




My SuperNova 250's sometimes shuts off too early in manual mode with 2700Nimh receiver packs,the auto mode worked better.
for me
It seems to depend on a few factors,the main one being how new the pack is,if the pack is new and has had only 1 or 2 slow overnight charges before use it tends to false peak if you try to charge at more than 500ma or so in manual mode.It seems you have to gradually let the packs know what they need to get used to


The best thing with either of these chargers is they count the number of mA that have gone into a pack, so if you've left the charger unattended you can usually tell if it has peaked too early ,once you get to know how many flights= how many mA to expect to have gone from the pack.
10-04-2002 Over year old.
 
 
aashu
Key Veteran
Location: Garden State , NJ

Hey

I have a Dymond Turbo which works very well . However looks like it is not mean for Lithium batteries (cmcorders) thinking of doing a trade with SuperNova ..anyone??

Proudly Flying in NJ, USA
10-04-2002 Over year old.
 
 
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