3000Mah Ni-cd pack for 25% Yak-54

3000Mah Ni-cd pack for 25% Yak-54
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3000Mah Ni-cd pack for 25% Yak-54 - 12/10/2007 7:39:49 PM

Pilot013

Posts: 42
Joined: 5/7/2007
From: Sofia, BULGARIA
Status: offline

Hi to everybody!

I want to buy for my Great Planes Yak-54 25% a 3000mah Ni-Cd 6V pack available from batteryspace. The price there is about 25$. I noticed that the weight is very accepetable and the cells are Sc. I'd like to hear your opinion about this pack! Now I am flying with a 6V pack 2000 mah.

Here is the link to the batterie's page:

http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=3761

Waiting for your commentary!

Post #: 1

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/10/2007 8:22:04 PM

k8svrick

Posts: 124
Joined: 3/21/2007
From: Columbus, OH, USA
Status: offline

I don't see a problem using that pack. NiMh would require less space and would probably be a bit lighter as well. Do you have a particular reason for using NiCd cells? Price maybe?

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Rick - Columbus, OH
www.ricktressler.com

(in reply to Pilot013)

Post #: 2

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/10/2007 8:40:56 PM

Pilot013

Posts: 42
Joined: 5/7/2007
From: Sofia, BULGARIA
Status: offline

Hi!

Well, as far as, this site is a more special one for batteries the choice is limited. In the Ni-Mh section there aren't many nice packs for the RC purposes. Also the price is good. Currently I am flying the Yak-54 with a Ni-MH batteries bought from Tower Hobbies. Well the reason is that I just want to have more power without recharging. Now the batteries won't last for more than 1 hour and half. You think Ni-CD are bad? Well if somebody could propose to me a 3000mah 6V Ni-Mh and light weight of course, I'll be more than happy!

Best regards!

(in reply to k8svrick)

Post #: 3

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/10/2007 11:12:13 PM

OldRookie

Posts: 636
Joined: 12/11/2001
From: Prior Lake, MN, USA
Status: offline

If you are using a single 5 cell RX battery pack, I would go for the NiCd. If one cell goes out an a NiMh pack you will loose all power to your system, if you loose 1 cell on the NiCd battery, you are flying at 4.8v approximately, depending on the charge.
The NiMh are good for a redundant set-up.
This is the way I understand it. Please correct me if I am wrong.

Greg

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LiFe is Great

(in reply to Pilot013)

Post #: 4

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/11/2007 6:29:21 AM

Pilot013

Posts: 42
Joined: 5/7/2007
From: Sofia, BULGARIA
Status: offline

Hi Greg!

I think you are correct. I plan to put this pack for the RX of the plane. I am using 6 Futaba S3305 at 6V and 1 JR for the throttle.
I noticed that on all the servos is written, that's better to use them with a Ni-Cd batteries. I don't know why, maybe there is a reason!

Best regards!

(in reply to OldRookie)

Post #: 5

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/11/2007 2:20:16 PM

SitNFly

Posts: 608
Joined: 2/22/2002
From: Four Corners, USA
Status: offline

If you would like to read a good comparison of the various battery chemistries available, go to http://www.hangtimes.com/ and click on the links on the left side of the page. Good NiMh are just as capable of delivering current as NiCds. They are lighter as well. The downside is that they are not as rugged and they self-discharge quicker. I run 4 cell NiMh from NoBS in my 87" QQ Yak and they are great packs.

(in reply to Pilot013)

Post #: 6

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/11/2007 5:08:48 PM

Pilot013

Posts: 42
Joined: 5/7/2007
From: Sofia, BULGARIA
Status: offline

Hi!

Thanks for the info - nice site!

Well let's do it like that, could you suggest me from where I could buy a 3000mah Ni-Mh 6V Sc dimension if possible, and I'll buy them. I just went towards the Ni-CD because I saw a nice pack. If somebody could help me I'll be very happy of buying this kind of pack!

Best regards!

(in reply to SitNFly)

Post #: 7

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/13/2007 7:00:42 PM

Flyfast1

Posts: 382
Joined: 9/25/2005
From: Livermore, CA, USA
Status: offline

From what I've read on these forums and from information provided by Futaba, the 3305s draw a lot of current. So, the NiCds might better, depending upon the internal resistance of the NiMH packs.

What is the rationale on a NiMH pack that if a cell dies the entire pack dies?

-Ed B.

(in reply to Pilot013)

Post #: 8

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/15/2007 9:57:27 PM

OldRookie

Posts: 636
Joined: 12/11/2001
From: Prior Lake, MN, USA
Status: offline

Flyfast1,

I have been looking at a lot of sites for battery packs, and other electronic equipment for a 30% gas plane set-up. One of these sites stated that when a NiMh pack looses a cell that the whole pack is in a short out condition. I have never heard this before either, and figured I would bring it up here. That is why I asked to be corrected if wrong. I tried to find the site again but couldn't. I was at the site twice and read it both times. This statement was in the context that a 5 cell NiCd pack is more reliable than a 5 cell NiMh pack for the reason that if the pack had a bad cell the NiCd pack would still be at 4.8v and the NiMh would be in a short out condition.
If this information is true it would be good to know. Maybe someone that knows for sure could chime in and clear this up.

Greg

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LiFe is Great

(in reply to Flyfast1)

Post #: 9

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/16/2007 10:45:41 PM

Flyfast1

Posts: 382
Joined: 9/25/2005
From: Livermore, CA, USA
Status: offline

Greg,

I have never seen anything that indicates that if a cell goes bad in a NiMH pack, that the entire pack goes bad. I didn't think there was anything different about the construction or wiring configuration of a NiMH pack versus a NiCd pack, so it would seem to me that if a cell goes bad and shorts, that the pack becomes just a wire. So, the pack still provides current, just with one less cell. I don't see why having a NiMH cell go bad would make any difference. But, as you said, perhaps someone with more experience can confirm this. I am far from being a battery expert! In fact, since I fly warbirds, I still use NiCd packs. Any weight savings with NiMH is negligible for me and I am very careful about how I care for my batteries, so the memory issue isn't a problem for me. Also, the extra capacity provided by NiMH isn't that important to me. I use multiple receiver packs with separate switches and never fly any one plane more than four times in a day.

I will keep an eye on this thread and see what we learn.

Thanks,

-Ed

(in reply to OldRookie)

Post #: 10

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/19/2007 12:35:10 AM

Red Scholefield

Posts: 4973
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline

quote:

ORIGINAL: OldRookie

If you are using a single 5 cell RX battery pack, I would go for the NiCd. If one cell goes out an a NiMh pack you will loose all power to your system, if you loose 1 cell on the NiCd battery, you are flying at 4.8v approximately, depending on the charge.
The NiMh are good for a redundant set-up.
This is the way I understand it. Please correct me if I am wrong.

Greg

You are wrong, sorry. One cell failure (99.9% of the time it is a short) in either Ni-Cd or Ni-Mh, the 5 cell pack will operate like a 4 cell pack, that is one of the few advantages of using 5 cells

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Red S.
AMA 951 Leader Member

(in reply to OldRookie)

Post #: 11

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/19/2007 1:04:00 AM

Panzlflyer

Posts: 1940
Joined: 2/28/2002
From: Goldsboro, NC, USA
Status: offline

One Sanyo 1950 Faup 5 cell pack is capable of flying a 33% for 3-4 flights with 8411s or 5945s all round (9 servos) insane flying style.

The problem you have is the pack youre using. If it is a Hobbico Hydrimax Ultra or not it is utterly useless at handling any current draw and is some serious misinformation marketing.
Try discharging their so called high current pack (2000)as featured in many magazines and see how fast it drops voltage, I have even quit using them on ignition systems.

(in reply to Red Scholefield)

Post #: 12

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/19/2007 1:50:37 AM

Flyfast1

Posts: 382
Joined: 9/25/2005
From: Livermore, CA, USA
Status: offline

Thanks for the confirmation.

-Ed B.

quote:

ORIGINAL: Red Scholefield

quote:

ORIGINAL: OldRookie

If you are using a single 5 cell RX battery pack, I would go for the NiCd. If one cell goes out an a NiMh pack you will loose all power to your system, if you loose 1 cell on the NiCd battery, you are flying at 4.8v approximately, depending on the charge.
The NiMh are good for a redundant set-up.
This is the way I understand it. Please correct me if I am wrong.

Greg

You are wrong, sorry. One cell failure (99.9% of the time it is a short) in either Ni-Cd or Ni-Mh, the 5 cell pack will operate like a 4 cell pack, that is one of the few advantages of using 5 cells

(in reply to Red Scholefield)

Post #: 13

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/19/2007 2:00:53 AM

OldRookie

Posts: 636
Joined: 12/11/2001
From: Prior Lake, MN, USA
Status: offline

Thanks for clearing that up Red.
It didn't sound right, but needed to know.
Now if I could only find where I saw that.

Greg

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LiFe is Great

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Post #: 14

RE: 3000Mah Ni-cd pack for 25% Yak-54 - 12/20/2007 10:15:38 PM

feihu

Posts: 178
Joined: 11/17/2002
From: Sun City, AZ, USA
Status: offline

quote:

ORIGINAL: OldRookie

Thanks for clearing that up Red.
It didn't sound right, but needed to know.
Now if I could only find where I saw that.

Greg

I could be that a shorted NiMh cell burned its connection causing an open circuit - but that could also happen with a NiCad.

feihu

(in reply to OldRookie)