RunRyder - NIMH or Lipo?

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Beginners Corner > NIMH or Lipo?

KLOOP100
New Heliman
Location: NEWNAN, GEORGIA

Hi, Newbie here!!
I just purchased a Trex 600n and not sure what battery to use for the rx.
I have flown aiplanes for years but got out fo the hobby about 8 years ago, just getting back in and decided to try heli's. I am worried about having enough power for the digital servo's

07-21-2008 04:23 AM

Heli 770
Elite Veteran
Location: Lemon Grove, Ca. USA.

Kloop100
Welcome to RR.
It would help to know what your running and how often you want to recharge your batt.

07-21-2008 04:31 AM

JetFire
Veteran
Location: The Golden STATE

I was running S3151s cyclics and 9252 digitals for my rudder with a JR 2700mah NiMh on my 600N-pro and got three flights easily with mild 3D. However, i think the most ideal setup is with Aligns 2 in 1 with included lipo.

Trex600N Pro
Kinetic 50

-The ONLY way you fail is when you quit.-

07-21-2008 05:04 AM

KLOOP100
New Heliman
Location: NEWNAN, GEORGIA

I will be running 9252's for cyclics, 9254 on the rudder with a 401 gyro, and I had not planned on using any of Aligns elctronics

07-21-2008 07:57 AM

mchammer
Veteran
Location: California,USA

Quote
i think the most ideal setup is with Aligns 2 in 1 with included lipo.

i agree,it works nicely.

Peace Through Superior Firepower!!!

07-21-2008 08:32 AM

Pistol_Pete
Elite Veteran
Location: Tampa Bay non-Buccaneer

Quote
NIMH or Lipo?

Lipo.

lighter and charges quicker as well.

<><>...the lunatic is in my head...<><>

07-21-2008 02:58 PM

HOMEPAGE

MikeC
Key Veteran
Location: Wausau, WI

Quote
Lipo. lighter and charges quicker as well.

I'm confused by this. This came up before with the statement of quicker charges with Lipo vs NiMH. A NiMH can be charged at least at 2C so unless you're charging a LiPo at 3C or more, it's not any quicker.

Mike

Century Swift, Gaui 200, Blade MCX, Hirobo Sky Robo, Spektrum DX7

07-21-2008 05:35 PM

Zaneman007
Key Veteran
Location: Texas - USA

Quote
quicker charges with Lipo vs NiMH.

From my experiance, NiMH have a memory. Also, they do not like being charged quickly. When I charge a NiMH quickly, is dischagres quickly. A NiMH charged over a 15 hour period, will hold it's charge longer than a one charged in 1 hour. A 2500ma lipo seems to last longer than a 2500ma NiMH.

Now back to the original question?

?

NiMH or Lipo?
IMO
*NiMH will start to get "mushy" as the voltage decreases.
*If your running a spectrum Rx, your asking for a "brown out"
*Lipos charge quicker(see above), are lighter and last longer.
*Most Lipo systems are regulated, this translates to consistency.

In summary, lipos are more advantages for heli use than NiMH.

I'd rather be flying

07-21-2008 05:55 PM

Pistol_Pete
Elite Veteran
Location: Tampa Bay non-Buccaneer

A123 can be charged a tad higher than 4C. (and 1000 cycles as per specs same as NiCs.)

The "other" lipos can be as high as 3C with a balancer.

Unlike nimhs, with lipos you dont have to use the batt immediately after charging as they only loose 2% per month.

As you have been in the hobby before, if you still have a charger, then the cheapest route is NiCs...otherwise lipo (A123) is the way to
go.

http://www.rcgroups.com/forums/show...001&postcount=2

EDITED:

Quote
NiMH have a memory.

its NiCs the one with memory issues.

Quote
When I charge a NiMH quickly, is dischagres quickly

thats a first for me.

<><>...the lunatic is in my head...<><>

07-21-2008 05:56 PM

HOMEPAGE

Pistol_Pete
Elite Veteran
Location: Tampa Bay non-Buccaneer

www.rcbatteryclinic.com

www.batteryuniversity.com

<><>...the lunatic is in my head...<><>

07-21-2008 06:02 PM

HOMEPAGE

Zaneman007
Key Veteran
Location: Texas - USA

Yes, that is my experiance.

Also, there is a internal resistance issue when trying to charge a Nicad or NiMH battery to quickly. They like to be charged slowly.

Tell me how long does it take to charge your stock Rx battery, with the stock charger. Unless yours is different, my JR radio says like 15 hours? I believe there is a reason for that?

No?

I'd rather be flying

07-21-2008 06:14 PM

Pistol_Pete
Elite Veteran
Location: Tampa Bay non-Buccaneer

Quote
Tell me how long does it take to charge your stock Rx battery, with the stock charger.

too long for some and why I upgraded to a smart programmable charger such as Triton.

Quote
Unless yours is different, my JR radio says like 15 hours? I believe there is a reason for that?:

yes there is a reason for it...the dual output wall charger that came with it is rated @ 65mA for Tx and 150mA for Rx which was meant for overnight charging NiCs, before lipos became the latest and greatest.

I also upgraded my Tx batt to a 3s 2100mA lipo as well since the 600mA NiC that came with the radio would not last that long anyways.

<><>...the lunatic is in my head...<><>

07-21-2008 06:26 PM

HOMEPAGE

Zaneman007
Key Veteran
Location: Texas - USA

dude,

I'd love to say that you are right, but..... IMO and from my experiance.....

have a good day.

I'd rather be flying

07-21-2008 06:38 PM

Pistol_Pete
Elite Veteran
Location: Tampa Bay non-Buccaneer

Not looking for a right or wrong.

Just pointing out specs and the vast amount of information available out there...thus the links.

Yours Nihm discharging as fast as it was charged seem to be a highly "unusual" experience.

Ultimately its up to the original poster to dissect the opinions given in here or other forums along with facts and apply accordingly.

Results may vary.

<><>...the lunatic is in my head...<><>

07-21-2008 07:00 PM

HOMEPAGE

MikeC
Key Veteran
Location: Wausau, WI

Quote
From my experiance, NiMH have a memory. Also, they do not like being charged quickly.

NiCad batteries have memory, not NiMH. I've run NiCad and NiMH batteries in both motor power and RX applications and have never experienced memory problems or problems charging them at 2C. As far as that goes, I never had much of a memory problem with NiCad.

It's true that you can't charge a NiMH at as high a rate as NiCad but at 2C, the recommended max charge for NiMH, it'll charge quicker than a LiPo at 2C since on a Lipo the charge tapers towards the end of the charge. So you'd have to charge a LiPo at more than 2C to get a quicker charge. I've never charged my LiPos at more than 1C so I don't know how much over 1C you can charge a LiPo at (assuming of course you have the right battery and charger to go over 1C).

Mike

Century Swift, Gaui 200, Blade MCX, Hirobo Sky Robo, Spektrum DX7

07-21-2008 08:09 PM

SkyWarp
Senior Heliman
Location: Planet Earth

I'd go liPo unless you don't mind the extra weight. NiMh has there spot in the foodchain, but the latest technology is found in the LiPos. However, It wasn't until recently that I made the switch myself. My Hydrides survived some of my ugliest crashes. Not sure if I could say the same for the Lipos.

Century Swift-
Anticipating a crash is worse than the crash itself.

07-21-2008 09:29 PM

Pistol_Pete
Elite Veteran
Location: Tampa Bay non-Buccaneer

FWIW...

When it comes to memory issues with NiCs, its mainly due to not discharging them completely PRIOR to recharging and where the memory issue can make its debut.

As far as Nihm...they do have their place. Mine had been underwater in a lake for well over 12 hours prior to its rescue (crashed in a lake and could not get until next day with a canoe) Sprayed Corrosion X after letting dry in sun for a few hours and to date still working.

<><>...the lunatic is in my head...<><>

07-21-2008 11:17 PM

HOMEPAGE

bigdog714
Senior Heliman
Location: Chardon, Ohio U.S.A.

Quote
If your running a spectrum Rx, your asking for a "brown out"

Hi Mike , there's that brown out thing again

Quote
i think the most ideal setup is with Aligns 2 in 1 with included lipo

Be careful with the 2 and 1 if your not flying 2.4, the 72mhz seems to get some glitches.

You will get three flights out of the 1900mAh RX pack, so get a spare, unless you have some 3S 2100mah left over from your 450 days, I get 8-9 flights and the weight helped me balance out the CNC tail.

EVO 50
Logo 14
Align T-Rex 600EP
Align T-Rex 600N

07-24-2008 12:57 AM

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Beginners Corner > NIMH or Lipo?

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