RE: A123Racing Battery Questions (Full Version)

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SS Pede -> RE: A123Racing Battery Questions (11/29/2007 1:00:36 AM)

Yeah, a couple different sites that sell the LBA10 say it is A123 compatible.



coro_sk -> RE: A123Racing Battery Questions (12/3/2007 12:24:18 PM)

there are 2 versions of LBA10, one older, and second newer. Named LBA10-A, and it has A123 support, with A123 text and led on it to show which mode is active (Lipo / A123 switchable).
I have been told that 1210i charger will show and incorporate data about cell voltages from balancer, in A123 charge mode, only if LBA10-A is used. ?



Rcgasserman -> RE: A123Racing Battery Questions (12/6/2007 11:24:58 PM)

I have 2 quick ? Can I cut and lengthen the charge cords? I can make an adapter cord to lengthen the main charge wire but can I cut and lengthen the balance wire? Also will running with low voltage cutoff on on my speed control shorten run times? It is set for the factory LiPo 3.2 volts per cell cut off. Thanks.



SS Pede -> RE: A123Racing Battery Questions (12/7/2007 6:45:04 AM)

I don't see why you couldn't lengthen any of the charge/balance wires as long as you do a good, clean job. It might technically void the warranty.

Turn of your ESC's low voltage cutoff. Just pretend these cells are NiMH. If you leave the LVC on it will activate too soon due to the lower voltage of A123 cells.



OCR99 -> RE: A123Racing Battery Questions (12/7/2007 6:28:46 PM)

So long as you don't make them to lone without going with larger wire or you can lose voltage

Rick



mark_d -> RE: A123Racing Battery Questions (12/20/2007 7:12:14 AM)

The TME EXTREMA just released a balacing system. It will ballance any lithium battery up to 12 cells and can trend the charge or discharge on through a power systems as a pc enabled watt meter. Here is a http://www.tmenet.com/index2.htmlink.



dragon_no_fly -> RE: A123Racing Battery Questions (12/22/2007 4:22:33 PM)

Guys, what are your personal experiences with the A123 2,300 and/or 1,100 mAh cells in cold weather;
that is, temperatures at or below 38 degrees F? Is there any possibility of damaging the cells in temperatures
at or below freezing if fully charged? I know that the FMA Cell Pro series of chargers help protect lipoly cells
from higher voltages in cold temperatures which could significantly affect the lifetime of the cells. Do you know
of any such limitations with these Lithium Nano-Phosphate-based cells?



everydayflyer -> RE: A123Racing Battery Questions (12/22/2007 5:38:38 PM)

I wish A123 would stop moving their spec. sheet



http://www.a123racing.com/SpecSheets/MD10002-00-RCDevKit.pdf

Below 0C (32F) max. charge to 4.2 per cell / dischage 0.5 per cell.

Personal experience.

I have flown 3S-5S 2300 packs at min. of 38F pack temp. and only noticed a slight power reduction.
I have flown th 1100s in mid fourties and did not really notice that much difference in power.

Note all of my aircraft are grossely over powered.

As a comparison I use to have to pre-warm LiPolys if the temps. were below 60F but do not bother with this with A123s.

Charles



dragon_no_fly -> RE: A123Racing Battery Questions (12/24/2007 8:19:34 PM)

Thanks everydayflyer for that info. Does anyone know if A123 Systems/Racing will be releasing any other
sized cells in the near future, such as 20 gram 500-600 mAh ones? I know of a few models those could
go into.



everydayflyer -> RE: A123Racing Battery Questions (12/24/2007 8:34:20 PM)

Have you heard of LiPolys?

Seriously, batteries are not developed for us R/C ers.
It was close to two years between the A123 Racing 2300 mAh cells and these 1100 mAh ones and neither were developed for us.

The power density of the smaller cells is not as good and going smaller would be even worse IMO. There would be a greater demand/ market R/C wise for cell s in the 3000 to 4000 mAh range but I for one do not expect to see amy such sizes becoming available but then who knows.

Charles



richg99 -> RE: A123Racing Battery Questions (12/27/2007 6:26:54 PM)

This may have been posted here before, but a "search" produces hundreds of pages of returns????.

Can the Astro 109 charge A123 3c packs? I seem to remember that someone added a resistor to "fool" the Astro 109 to do the job. If a "Zip charger" is a better way to do it, where can I find specific plans to make one?

A number of my ( all brushed motors) planes call for 3c Lipos 11.1 volts...I am better off running A123s in a 3 cell pack and using a larger prop...or making up a 4 cell A123 pack? When do I burn out the motors with too much voltage?

Thanks Rich



everydayflyer -> RE: A123Racing Battery Questions (12/30/2007 3:20:03 AM)

AF 109 mod thread Link and many more here.

http://www.rcgroups.com/forums/showpost.php?p=6769001&postcount=2


3S A1123 is lower volts than 3S LiPoly if the Lipos are good ones but A123 handle amps. extremely well so just prop or gear for more amps.

Zip charger. Well if you need step by step it is not really a good project for you.

Charles



everydayflyer -> RE: A123Racing Battery Questions (1/21/2008 3:39:25 PM)

Sometimes it is interesting to reread a Thread from the start and compare early ststement with current field experience.


Very early on we were warned about possible damage to cells if we used DeWalt packs to built our own.

http://www.rcuniverse.com/forum/fb.asp?m=4795512
Snip:

quote:

Applying the heat from the soldering gun directly to the cell is very bad for it. When the heat is applied the electrolyte inside the cell actually boils creating a gas behind the anode or the cathode. This will degrade the lifespan of your cell dramatically. This should also be noted when working with a Dewalt pack. When you get a Dewalt pack most people cut the straps that hold the battery together in half. This leaves you with a tab that is to short to do anything with. People wind up soldering the wire to this short tab, because they are soldering so closely to the cell that heat can cause the same problem discussed above. In regards to the price, a Dewalt pack retails in stores for $159.99 ($16 / cell), which is where we base our pricing for our cells.


Well over a year has passed and all of my built from DeWalt packs are still alive and well.

One poor little 3S has been charged at over 100 amps. starting current / 4:12 charge time ,ran flat close to 200 times and still delivers over 2000 mAh.

Another 3S has been charged at 15-20 amp. average (6-10 min) charges with starting amps, between 20-30 amps. It has 327 flights on it ans still delivers over 2100 mAh.

I have never paid more than $110 for a DeWalt pack delived to my door and some have been less than $90.


post here on RC U with graph

http://www.rcuniverse.com/forum/fb.asp?m=6774037

Charles



dirtybird -> RE: A123Racing Battery Questions (1/23/2008 11:53:16 PM)

It just makes sense to be very careful and use a heat sink when solderng to those cells. I ruined an 1100mah cell soldering to it.



everydayflyer -> RE: A123Racing Battery Questions (1/24/2008 9:57:48 PM)

Then I would advise against trying this.Cell is a Lithium used in a JR PROPO R 756.
Factory one was spot welded to contacts and JR wanted to much and to long to eplace it so I soldered on leads,placed heat shrink on it and soldered leads to contacts. Modification made about two years ago.

Charles



decay -> RE: A123Racing Battery Questions (1/25/2008 12:08:31 AM)

That technique with the button cells has been used for years by
Electronic Technicians.



everydayflyer -> RE: A123Racing Battery Questions (1/27/2008 12:28:11 AM)

And even non Electronic Technicians.
Back in the 60's I use to solder leads to very small NiCd button cells which were used in 18" WS Cox TD .010 powered single channel pulsed rudder R/C planes.
I just posted photo to show that soldering to small (low thermal mass) sensitive cells is not really all that difficult if you have good equipment and the skill to use it.

I get real amused at those who seem to have such a difficult time soldering deans Ultras , bullet connectors and the like.

Charles



topdan -> RE: A123Racing Battery Questions (2/15/2008 4:20:01 PM)

Hi everyone.
I just bought a Nitro Thunder Tiger Bike,
I'm new at this, so i'm reading the manual and says that i need a RX battery pack for the reciver, and thats all it says.
Wath kind of battery do i need?[:(]



SS Pede -> RE: A123Racing Battery Questions (2/19/2008 12:51:07 AM)


quote:

ORIGINAL: topdan

Hi everyone.
I just bought a Nitro Thunder Tiger Bike,
I'm new at this, so i'm reading the manual and says that i need a RX battery pack for the reciver, and thats all it says.
Wath kind of battery do i need?[:(]

While some people use A123 cells for receiver packs (especially in aircraft), it is more common with nitro vehicles to use a 5 cell NiMH pack. Go to www.towerhobbies.com and search for receiver pack, you will find what I am talking about.



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