Why not NiMH ?

Why not NiMH ?

Post by Carsten Schmo » Wed, 03 Jul 1996 04:00:00



Hi there!

Every batterie guru out there is talking about how to handle
NiCd accu packs.

Why are NiMH accu packs so uncommon in rc racing?
Problems with high current drain ?
Loading cycles ?

Or am I completely wrong and every one uses them ??

Any comment is appreciated,
--
Carsten.

 
 
 

Why not NiMH ?

Post by Joel Down » Wed, 03 Jul 1996 04:00:00


Quote:

> Hi there!

> Every batterie guru out there is talking about how to handle
> NiCd accu packs.

> Why are NiMH accu packs so uncommon in rc racing?
> Problems with high current drain ?
> Loading cycles ?

> Or am I completely wrong and every one uses them ??

> Any comment is appreciated,
> --
> Carsten.


If memory serves, I think they have high internal resistance, so
they might give good runtime, but no punch whatsoever.  

Joel

-*-----*-----*-----*-----*-----*-----*-----*-----*-----*-----*-----*-
                              Joel Downs
Oracle Corporation                                      TriVAR Racing

Manufacturing Applications    http://dnclab.berkeley.edu/~joel/trivar

 
 
 

Why not NiMH ?

Post by MHasw508 » Wed, 03 Jul 1996 04:00:00


Also NiMh cost more than NiCd
Mike

 
 
 

Why not NiMH ?

Post by Todd Dre » Wed, 03 Jul 1996 04:00:00


also, they are Currently VERY exspensive! mostly due to portable
computer and other cordless apps (cell phones, ect).

they do have longer run time, Im not sure about internal impedance,
but they can't be FAST charged like we do our NI-Cd's.  their fast
charge is about 1-2 hrs for an 1800-2000 ma cell <this is just an
approximation>.  They also do not peak the same as Ni-Cd's do, so
our existing peak chargers don't work right!

 
 
 

Why not NiMH ?

Post by Bryce Hodgema » Wed, 03 Jul 1996 04:00:00


Quote:

> Hi there!

> Every batterie guru out there is talking about how to handle
> NiCd accu packs.

> Why are NiMH accu packs so uncommon in rc racing?
> Problems with high current drain ?
> Loading cycles ?
> NiMH batterries are very slow charging and are not meant to be charged as many times

as a Nicd battery can handle.  We use NiMH batteries in some of our laptops.  IMHO
I prefer a Nicd anyday.

Bryce

 
 
 

Why not NiMH ?

Post by Adrian T » Thu, 04 Jul 1996 04:00:00


NiMH cells also have a tendency to catch fire when they overheat.

But I do wonder why nobody makes NiMH receiver and transmitter packs.

----------------------------------------------------------------------


----------------------------------------------------------------------
All views and comments are property of the abovenamed.
Unauthorized duplication/relay by Microsoft or its subsidiaries is a
violation of applicable laws. All other parties have free access.
----------------------------------------------------------------------

 
 
 

Why not NiMH ?

Post by nytr.. » Thu, 04 Jul 1996 04:00:00



Quote:
>NiMH cells also have a tendency to catch fire when they overheat.

>But I do wonder why nobody makes NiMH receiver and transmitter packs.


>----------------------------------------------------------------------

I wouldn't say that nobody makes rx or tx packs, pick up any Tower hobbies
catalogue and look up Hobbico
 
 
 

Why not NiMH ?

Post by shshu » Thu, 04 Jul 1996 04:00:00


Actually, Tower Hobbies does carry a manufacturer that makes them, can't
remember their name though.

Kenneth

 
 
 

Why not NiMH ?

Post by Dave » Fri, 05 Jul 1996 04:00:00


Quote:

> NiMH cells also have a tendency to catch fire when they overheat.

> But I do wonder why nobody makes NiMH receiver and transmitter packs.

> ----------------------------------------------------------------------


> ----------------------------------------------------------------------
> All views and comments are property of the abovenamed.
> Unauthorized duplication/relay by Microsoft or its subsidiaries is a
> violation of applicable laws. All other parties have free access.
> ----------------------------------------------------------------------

I have heard a lot of complaints about the NiMH's not having much capacity compaired to
Ni-Cad's from guys that have used both in their laptop's. They have also made remarks
about how the NiMH's fail early in life.

.

 
 
 

Why not NiMH ?

Post by John A. Wels » Sat, 06 Jul 1996 04:00:00


They Do.

JW

_________________--


Quote:
> NiMH cells also have a tendency to catch fire when they overheat.

> But I do wonder why nobody makes NiMH receiver and transmitter packs.

> ----------------------------------------------------------------------


> ----------------------------------------------------------------------
> All views and comments are property of the abovenamed.
> Unauthorized duplication/relay by Microsoft or its subsidiaries is a
> violation of applicable laws. All other parties have free access.
> ----------------------------------------------------------------------

 
 
 

Why not NiMH ?

Post by Todd Dre » Sun, 07 Jul 1996 04:00:00


Quote:

> Hello,
> I have a 1200mah NiMH reciever pack in my 1/8 gas on-road and I think it
> is the best kind of battery. It has a better capacity than Nicd's, is
> smaller, and is lighter. It has never caught on fire and I don't think it
> ever will. Tower Hobbies sells them. The company that distributes them is
> Hobbico.
> Simon.

they fire problem they have is caused during 'fast' charging, especially
if you use the improper charger.  they react differently than a normal
ni-cd when they are fully charged, thus a normal peak charger is not
the proper device to use with them.
 
 
 

Why not NiMH ?

Post by Lawrence Yeun » Mon, 08 Jul 1996 04:00:00


Hello,
I have a 1200mah NiMH reciever pack in my 1/8 gas on-road and I think it
is the best kind of battery. It has a better capacity than Nicd's, is
smaller, and is lighter. It has never caught on fire and I don't think it
ever will. Tower Hobbies sells them. The company that distributes them is
Hobbico.
Simon.

 
 
 

Why not NiMH ?

Post by Adrian T » Mon, 08 Jul 1996 04:00:00



tes:
->
->Hello,
->I have a 1200mah NiMH reciever pack in my 1/8 gas on-road and I think it
->is the best kind of battery. It has a better capacity than Nicd's, is
->smaller, and is lighter. It has never caught on fire and I don't think it
->ever will. Tower Hobbies sells them. The company that distributes them is
->Hobbico.

I was referring to the NiMH cells in electric cars. These are really tortured
and I believe they catch fire easily when they overheat.

The NiMH receiver pack sounds good. I ought to get one for my 1/8 gas on-road.

----------------------------------------------------------------------


http://www.singnet.com.sg/~adriant/rc.html        Adrian's Speed Demons
----------------------------------------------------------------------
All views and comments are property of the abovenamed.
Unauthorized duplication/relay by Microsoft or its subsidiaries is a
violation of applicable laws. All other parties have free access.
----------------------------------------------------------------------

 
 
 

Why not NiMH ?

Post by Lawrence Yeun » Tue, 09 Jul 1996 04:00:00


Well I am just charging them with a over night charger because they are
for my reciever. (I run 1/8 on and off road gas cars) When you fast
charge them they probably will catch on fire and that;s why the
instructions say not to!
Simon.

 
 
 

Why not NiMH ?

Post by Rcmadman » Thu, 18 Jul 1996 04:00:00


Hobbico makes them .

Anthony