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RE: A123Racing Battery Questions - 7/12/2007 6:01:14 AM   
SS Pede



Posts: 306
Joined: 2/2/2006
From: Reading, MA, USA
Status: offline 		*Ping* Still hoping to hear some word of new pack sizes/configurations. I could get a current pack but I would like a more standard-sized one.

(in reply to Tex Gehman)
       Post #: 226

RE: A123Racing Battery Questions - 7/14/2007 3:24:22 PM   
DLS II


 

Posts: 73
Joined: 11/28/2006
From: Rantoul, IL, USA
Status: offline 		I came across a statement on the net that the new smaller cells are AA size at 1200 mah- but I can't verify this. Don

(in reply to SS Pede)
       Post #: 227

RE: A123Racing Battery Questions - 7/14/2007 4:12:15 PM   
Red Scholefield



Posts: 4624
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline
quote:

ORIGINAL: Tex Gehman

Great info, all. I've been using SPTs for years on NiCd and NiMH cells, and can't see just how one would attach balance leads to all cells, in say, a 6S pack like I will be using. Tex.


It is quite easy, just insert a small strip of brass shim stock between the cells before you add the end caps and long theaded rods. Let the shim stock stick out far enough to solder the balancing leads to.


_____________________________

Red S. AMA 951
R/C Battery Clinic
www.rcbatteryclinic.com

(in reply to Tex Gehman)
       Post #: 228

RE: A123Racing Battery Questions - 7/15/2007 1:21:06 AM   
OCR99


 

Posts: 43
Joined: 7/13/2004
From: PLOVER, WI, USA
Status: offline 		I have 123 cells 2300 ma i put them in 3&4 cell packs i have a 60 size eflight with 7 cells in searis and 16x10 prop i get 54 amps 1100 watts at prox 6400 rpm---with 17x10 i get 59 amps 1200 watts at 6500 rpm this all when plane in one place on ground.The plane flew great straight up harrires and so on aprox 8 min flying,i am goig to try same set up in parrallel dont know if exrta 1 lb will make much diferance im afraid it will take away 3d capability,amy body know how much amp differance in flight compared to ground?
Rick

(in reply to SS Pede)
       Post #: 229

RE: A123Racing Battery Questions - 7/15/2007 1:51:20 AM   
Tex Gehman


 

Posts: 39
Joined: 5/9/2007
From: Winnipeg, MB, CANADA
Status: offline
quote:

ORIGINAL: Red Scholefield

It is quite easy, just insert a small strip of brass shim stock between the cells before you add the end caps and long theaded rods. Let the shim stock stick out far enough to solder the balancing leads to.



Red: I've also been told that I can just hammer the buggers with amps and they'll eventually sort themselves out. My brief experience with them leans towards this philosophy. Tex.

(in reply to Red Scholefield)
       Post #: 230

RE: A123Racing Battery Questions - 7/15/2007 2:31:58 AM   
Richard D Bahmann aka/Wrongway



Posts: 1940
Joined: 1/7/2004
From: Ormond Beach, FL, USA
Status: offline 		Hammer them....do you mean like this?........



http://www.youtube.com/watch?v=GDHJNG2PngQ

_____________________________

Gonna kick the tire and light up my
Torch...Gone Flying...------WrongWay

(in reply to Tex Gehman)
       Post #: 231

RE: A123Racing Battery Questions - 7/15/2007 3:27:49 PM   
Red Scholefield



Posts: 4624
Joined: 12/8/2001
From: Newberry, FL, USA
Status: offline
quote:

ORIGINAL: Tex Gehman

Red: I've also been told that I can just hammer the buggers with amps and they'll eventually sort themselves out. My brief experience with them leans towards this philosophy. Tex.



Be my guest . . . . at US$10 per cell.


_____________________________

Red S. AMA 951
R/C Battery Clinic
www.rcbatteryclinic.com

(in reply to Tex Gehman)
       Post #: 232

RE: A123Racing Battery Questions - 8/7/2007 6:39:54 PM   
ronin149


 

Posts: 1
Joined: 8/7/2007
From: , UT, USA
Status: offline 		I work for a small R&D firm. One of our specialties is electric traction. Your batteries get all of us very excited! They are quite literally the batteries I have been waiting my whole career for. My question: Are there any Li-ion supervisor chips that are tailored for use with A123 battery systems? I've done hours of research, & the voltage thresholds are always wrong. I can get them in 0.05V increments from 4.1V up to 4.35V, all too high considering my 3.6V final voltage. Today I start designing a circuit from scratch, but I thought I'd ask just in case someone knew of something.

thanks,
Jeff
ICONIX R&D

(in reply to Red Scholefield)
       Post #: 233

RE: A123Racing Battery Questions - 11/3/2007 9:03:33 PM   
skyrider2



Posts: 20
Joined: 9/24/2002
From: Ocala, FL, USA
Status: offline 		I received an email today (11/3) from Hobby City

https://www.unitedhobbies.com/UNITEDHOBBIES/store/uh_viewItem.asp?idProduct=5632

saying that the Yuntong 2700 mah LiFePo4 cells are now available @ $10.50 each.

skyrider2

(in reply to ronin149)
       Post #: 234

RE: A123Racing Battery Questions - 11/4/2007 10:30:21 PM   
OCR99


 

Posts: 43
Joined: 7/13/2004
From: PLOVER, WI, USA
Status: offline 		DO THEY HAVE SOLDERING TAPS IT WAS HARD TO SEE?
RICK

(in reply to skyrider2)
       Post #: 235

RE: A123Racing Battery Questions - 11/5/2007 4:13:05 PM   
bradman


 

Posts: 3
Joined: 1/10/2007
From: Dayton, OH, USA
Status: offline 		PLEASE NOTE!!!! that Hobby City LiFePO4 cells are not A123Racing cells. They do not utilize our patented Nanophosphate technology and therefore have very different performance characteristics.

Make sure you know what you are purchasing. People have purchased cells similar (if not the same) and found when they received them that they were rated for a 2C (not 20C) discharge.

Power . Safety . Life

Brian


(in reply to OCR99)
       Post #: 236

RE: A123Racing Battery Questions - 11/5/2007 10:44:46 PM   
OCR99


 

Posts: 43
Joined: 7/13/2004
From: PLOVER, WI, USA
Status: offline 		THANKS FOR HEADS UP
RICK

(in reply to bradman)
       Post #: 237

RE: A123Racing Battery Questions - 11/27/2007 4:53:44 AM   
SS Pede



Posts: 306
Joined: 2/2/2006
From: Reading, MA, USA
Status: offline 		Is there a balancer that could potentially balance A123 and LiPo packs? I have not yet purchased a new generation of batteries for my truck, but if I ended up owning LiPo and A123 packs it would be nice to have a single device that would balance both. Say I got a balancer with just pins as a plug, without the plastic housing, so it would fit any balance tap with the right pin configuration. Would an Astroflight Blinky (regular, not A123 version) balance an A123 pack if it was fully charged? This would be to avoid tripping the Blinky's low voltage protection.

(in reply to OCR99)
       Post #: 238

RE: A123Racing Battery Questions - 11/27/2007 12:15:12 PM   
OCR99


 

Posts: 43
Joined: 7/13/2004
From: PLOVER, WI, USA
Status: offline 		Yes the astro blinky makes them they are same except you need ywo because of differant voltages on batteries

Rick

(in reply to SS Pede)
       Post #: 239

RE: A123Racing Battery Questions - 11/27/2007 8:59:02 PM   
SS Pede