RunRyder RC
WATCH
 1 page 648 views Post Reply
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › NiCad vs NiMh vs LiIon/regulator
09-06-2006 04:10 PM  14 years ago
Topic Vote0Post 1
StillTryin

rrApprentice

Perth, Western Australia

MyPosts All Forum Topic
NiCad vs NiMh vs LiIon/regulator
I would be most grateful for some advice.

I have recently upgraded to digital servos in my Rappy 50 and seem to be using a minimum of 350mAh per flight from my Rx battery pack which presently is a 4.8V 1700mAh NiCad pack. I recharge after every third flight.

I feel I should upgrade to a higher capacity Rx pack and suggestions have included going to lithium ion 2400mAh plus a Fromeco regulator or NiMH 2400mAh. I've heard bad stories regarding NiMH not being able to deliver enough current and the added complexity/cost of the regulator etc is a concern.

Maybe I should stick with my current technology.
SHARE  PM  EMAIL  Attn:RR  Quote
09-06-2006 04:53 PM  14 years ago
excellone

rrApprentice

Springfield, Virginia

MyPosts All Forum Topic
Go LiIon and don't look back. Flying rather than charging will improve your skills. Nicads require maintenance (cycling) and will not provide the consistency in control response as LiIons.

Hope this helps,

George
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-06-2006 05:30 PM  14 years ago
BarracudaHockey

rrMaster

Jacksonville FL

MyPosts All Forum Topic
LiIon is the way to go, 8 to 10 flights per charge on my 50s, constant voltage from 1 flight to the next.

Current quality NiMH cells in SubC in the larger packs have lower internal resistance and can handle the load of digitals, they dont have a memory but they can get heavy in the larger capacities.
Andy
AMA 77227
http://www.jaxrc.com
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-06-2006 07:33 PM  14 years ago
TonyTypeS

rrElite Veteran

New Orleans, LA & El Monte, CA

MyPosts All Forum Topic
If your on a budget than get the NiMH sub C packs.

Im using the 4000mah sub C packs and they work perfect. Right now im a lil nose heavy, but I also have the 9254 tail servo up in the front tray. If i move the servo to the rear it should balance out perfect. I have gotten over 7 flights and the voltage is still great. It's only on the second LED from full power on my voltwatch. You can get 4 cells for about 25 bucks.

LiIon/regulator is prob about half the weight of my sub C pack. If you choose to get the LiIon than get a bigger pack than the 2400mah. You will get more run time with less recharging

NiMH ==========$25
LiIon w/reg====$100+
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
09-06-2006 07:52 PM  14 years ago
JR_Vibefreak

rrApprentice

Bangkok Thailand & UAE Dubai

MyPosts All Forum Topic
Well Lipos can be very stable at fix 5.6 and 5.1 volt
if you load hard the lipo wont drop its current
and Nimh has less memory effect then Nicad while Nicad give out more boost/load
simple!
GIXXER4LIFE Philipp
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-08-2006 01:41 AM  14 years ago
StillTryin

rrApprentice

Perth, Western Australia

MyPosts All Forum Topic
Thanks to everyone for the replies and good advice. I will go with the LiIons and reg.
SHARE  PM  EMAIL  Attn:RR  Quote
09-08-2006 03:07 AM  14 years ago
racingstripe

rrVeteran

Sacramento, CA

MyPosts All Forum Topic
Maybe i'm jumping in a little late...

Did you notice a big difference switching to digitals aside from the added drain on the battery?

Have you considered the replacement cost of a battery (or reg) should it become damaged in a crash?

I've flown analong vs. digital on a standard mix 50. The digitals aren't that much better, not enough for me to spend $100+ on a battery system or strapping a sub-C monster to my heli.

I compromised some control precision by using 9202 analog servos on the cyclics. With a 9252 digital on the collective, a GY601 and 9602 on the throttle, I'm at 4.7v at the end of the 5th flight. I use a NiMH pack that uses Sanyo 1950FAUP cells. This particular cell has a lower internal resistance than a typical NiMH battery and is probably the only NiMH cell smaller than a sub-C that can hanlde an all digital application (I run the same pack in a Freya with all digi's).

andy-
Proofread carefully to see if you any words out.
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
09-08-2006 06:28 AM  14 years ago
StillTryin

rrApprentice

Perth, Western Australia

MyPosts All Forum Topic
RacingStripe
Thanks for your input. You have a valid point - it's always hard determining whether an upgrade represents an improvement or just bling. At my stage with helis, I have to rely on expert opinion and that can be divided as we all know only too well.

To answer your question, I think I have more accurate control responses and less need to correct the heli from wandering about through slop in the servo output arms but is it worth the $300.00 I paid? Probably not.

As for batteries - geez, I've seen some crashes through battery failure and have always been super careful with periodic cycling and capacity checks on my nicads. Several planks have gone in on NiMH and one heli had a fly away but these were through using the older NiMHs.


~DNA~ National Dyslectic Association
SHARE  PM  EMAIL  Attn:RR  Quote
09-08-2006 02:30 PM  14 years ago
firefox

rrApprentice

Thailand

MyPosts All Forum Topic
I got tired of constantly worrying about my battery capacity so I moved to the Li-polymer route, using fairly cheap components. I currently have two self-packed 2S 7.4V 2200mAh packs ($19 each pack) and two 3A BECs ($12 each) connected in parallel. This gives me a regulated 6V supply, 4400mAh of capacity, 6A (10A burst) current, and redundancy, all at the price of $62, and not much heavier than my old AA pack. Servos are noticeably faster and don't change throughout the flight (can do 10 flights easily per charge).

The resident "pro" at my field sneered at my setup (he's using the Fromenco Arizona and duralite li-ion packs), but to each his own.
SHARE  PM  EMAIL  Attn:RR  Quote
09-08-2006 02:35 PM  14 years ago
deafheliflyer

rrKey Veteran

Arizona

MyPosts All Forum Topic
hi
I use a 2800 troybuilt Lioon pack (26.00) And a Fromeco regulator (39.00) .. I get 6-7 flights out of my pack before needing to recharge..

I will never go back to NiMH's..... Li-ions are the way to go!!
Crash-Prone and overcoming it!!!
SHARE  PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 648 views Post Reply
HomeRC & Power✈️Aircraft🚁HelicopterRadio - Servo - Gyro - Gov - Batt › NiCad vs NiMh vs LiIon/regulator
Print TOPIC

 6  Topic Subscribe

Saturday, November 28 - 10:26 pm - Copyright © 2000-2020 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online