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HomeAircraftHelicopterThunder TigerOther › How many flights on 1400ma Nicd?
03-24-2005 11:48 PM  13 years agoPost 1
helibird

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St. George, UT

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My 2700 nimh battery failed monday and I'm in the process of switching to lipo for my all digital raptor 50v2. I have a new 1400 ma Nicd that I'm going to fly with this weekend, am I going to be charging this thing after every flight or do you think I'll be able to get two?

Setup...
rap50v2
jr pcm rx
3x9252
1x9254
1x9253
TJ Pro
GY401

I do mild 3d (flips, some ugly tic tocs, and rolls)

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03-25-2005 12:23 AM  13 years agoPost 2
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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You'll get two, then charge.

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03-25-2005 12:29 AM  13 years agoPost 3
earthmover

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Wellington (WPB) FL

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what do you mean by failed?
My 2700 nimh battery failed monday

Raptor 50v2, os50 hyper, mp2, TJ Pro, Futaba 9CHPS PCM

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03-25-2005 03:17 AM  13 years agoPost 4
helibird

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St. George, UT

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I think it was probably my charger but during a quick charge it got super hot. I tried to cycle it but it discharged about 1000ma and would only charge up 600 ma. I'm pretty sure I lost a cell.

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03-25-2005 04:53 AM  13 years agoPost 5
Flyfalcons

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Bonney Lake, WA

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Two at most.

_______________________

Ryan Winslow
X-Spec, EVO 50

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03-25-2005 05:23 PM  13 years agoPost 6
lightningrc

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UK

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Dont charge it unless it needs to or you will shorten its run time as the cells will get lazy and only run for that time.
I use a little voltage indicator light , once it gets to about half , then I charge them , but you should run the battery down before recharging , but not down dead flat.

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03-25-2005 07:35 PM  13 years agoPost 7
helibird

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St. George, UT

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I had one close call after putting the digital on the throttle with the TJpro. I'm currently putting everything together to switch to lipo. But I want to fly this weekend and all I have right now is my 1400. It sounds like I should be able to get a couple flights from it and then will quick charge.

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03-25-2005 10:43 PM  13 years agoPost 8
A. Bundy

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Aurora,IL. 30W/SW of Chicago

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1 and charge.2 tops if you check voltage before flying the second flight.9252s suck the power hard.It's only going to be a 15 minute top off on the batt quick charge anyway.I run 2400s in my R50 and go 2 and charge always.....If I have to buy a new pack every Spring who cares?The old packs go into the planes and you always have a good batt in your heli.

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03-25-2005 11:06 PM  13 years agoPost 9
MJWS

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Airdrie, AB - Canada

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Plenty of NIMH's are used in high current apps some at well over 200A. The 6A burst we ask of these cells as a receiver pack isn't even parkflyer current. The only reasonable argument against them is that they tend to fail open instead of closed. Even that is debated.

Take your 2 flights and stick it on the charger while you are chatting. It's nice to have insurance and fly the peaked pack any way. You can get more if you have an ESV with a decent load to measure... but it isn't worth it. As Al said it only takes a few minutes to peak them.

Yes there are long life low current nimhs out there, but even the worst somewhat modern cells will make easy work of our loads.

Mike

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03-26-2005 10:59 PM  13 years agoPost 10
helibird

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St. George, UT

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Went flying today and I was using about 350 ma a flight so could maybe squeeze three but I usually flew 2 and charged.

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03-26-2005 11:25 PM  13 years agoPost 11
raptor30

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Tilburg,The Netherlands

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NIMH are for low current draw applications.
Someone told me that the Nimh's that are now being produced and sold are just as good as Nicads,and that only the "older"Nimhs had the problems with high current draws.

Marcel

Powered by...Visa

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03-26-2005 11:42 PM  13 years agoPost 12
concept1

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Youngstown, OH

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yes today's NiMH cells are much better, they can take high current draw and quick chargeing much better then Nicads. I have been using NIMH cells on Combat wings for about 2 years, still using all my original NIMH packs, with no change in performance. my nicads all died after just a few flights. I am pulling 30 amps at 20 minutes flights. I have been using NIMHs in My Heli's as well I run 1800NIMh packs with no problems

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03-27-2005 12:35 AM  13 years agoPost 13
tech1

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Mississauga

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You have to consider the size (capacity) of your pack. While your 500Mah pack will have trouble supplying 1.5Amps ****inuous, a 1500Mah pack should have no problems.


I can get 2 flights comfortably off a 1500 pack.

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03-28-2005 09:12 AM  13 years agoPost 14
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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Concept, use a 2700ma NiMH pack of AA type cells in your combat wing, let me know how it does. I'm not putting sub-C,C, or D cells in anything I own, thanks.

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03-28-2005 09:32 AM  13 years agoPost 15
lightningrc

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UK

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Must say ive been running a chopped down sub C 7.2 battery to 6 volt 5 cell 2400 mah pack since last year in my .90 and its been superb , I luckly needed the extra weight to get the CG correct any way.

I should think about cycling the pack now before I have problems

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03-28-2005 10:36 AM  13 years agoPost 16
andythilo

rrApprentice

Saffron Walden, Essex, UK

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QUOTE -

The problem is this.

You are using a NIMH for a receiver pack.. Not something that you should do.. NIMH are for low current draw applications.

Digital servos are not conisdered low current draw by any means.

You need to stick with a NICAD battery vs the NIMH in the receiver.. Or screw them both and go lipo...


NICAD = high current = digital servos.
NIMH = Low currnent = transmitters.

Maybe, just maybe you could get away with using like DS811 servos with your nimh battery..BUT I would never use the servos you have with that nimh pack.. i cant believe that you didnt crash sooner.

I'm sorry, this just isnt true. Modern NiMh cells can handle high current draw just fine. I use 3300mAh sub c cells in my race cars and to condition these I discharge at around 20amps, some people discharge upto 30A. As long as you use quality connectors and build the packs properly you wont have any problems.

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03-28-2005 04:34 PM  13 years agoPost 17
concept1

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Youngstown, OH

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Al,
I use 1800MAh 4/5A NIMH cells hardly noticalby larger then a AA cell, (they are slighly shorter and just a hair fatter) they are good for 30 amps with 35 amp bursts, I have run these same cells on my brushless combat wing for 2 years now, and my setup pulls a continuous 27-28amps, they have had several hundred cycles and I have had no problems and I have yet to see any performance decline. I have also used these cells on a electric conversion of a LMH with a kyosho krypton crystal motor pulling 35 amps possibly more and had over 50 flights on it before I sold it. Batteries were hot but again I did not notice any damage, I still fly the packs. check out any E-forum and you will see nicads are not up to par with modern NIMH's this technology changed about 2 years ago. a 3 year old NIMH cell woild be worthless in my opinion.

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03-28-2005 05:42 PM  13 years agoPost 18
Al Magaloff

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Concept, I understand. I just wouldn't advise someone buy NiMH, as I think the chemistry was interim, at best.

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03-28-2005 06:40 PM  13 years agoPost 19
concept1

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Youngstown, OH

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Al,
just so you know I respect your opinion greatly, especially with Raptor stuff!! and at one point I lookind into the NIMH stuff a lot, they have really changed in just the last year, with my work I follow most consumer products and automotive as well, the new NIMH cells are even being used now in electric vehical applications, and in most all your "High end" cordless powertools of course not AA cells. their is a company in DC that has developed D sized cells for electric vehical usage (currently they have a elec bike in production) sold to military and police it will run 40MPH and up to 35 miles on a charge with a capacity of about 400lbs. but again their are still a lot of "cheap" cells out their and unless you know which ones to get don't buy the cheap NIMH cells. I think it comes down to preference, Lipo's are great also but their is risk their as well. trust me the NIMH's crash real well on a combat wing they take a real beating.

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03-28-2005 07:21 PM  13 years agoPost 20
nojohnny101

rrElite Veteran

10 miles north of Cincy, OHIO

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hey
speaking of capacity of batteries and batteries failing in flight
realy don't mean to hijack the thread....just don't think it's worth starting another
i recently had a crash due to flying to long (stupid mistake) on my stock 1100MAH reciever battery that came wiht my Airtronics RD8000
can someone recommend a MAH rating of a new battey that i shoudl get and where to get one
i really dont' want to have to buy a special charger or spending very much....but want to be able to fly all day....


Thanks
~Will~

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