RE: A123Racing Battery Questions

RE: A123Racing Battery Questions
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RE: A123Racing Battery Questions - 6/23/2007 10:57:54 PM

Richard D Bahmann aka/Wrongway

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Joined: 1/7/2004
From: Ormond Beach, FL, USA
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quote:

ORIGINAL: Red Scholefield

quote:

ORIGINAL: rdb127

Question, the specifications show an internal impededence of 8 milli-ohms per cell. Does this number change when running say a two cell setup for 6.6 v ?

Thanks

The per cell number does not change, but the number for a two cell pack becomes 16 milli-ohms total internal resistance. Neglecting any interconnect resistance which should be minimal.

Thanks Red, I am curious how they put out so much power. I have been using a Hangtime Hobbies FAUP1950 battery which is advertised at 4 milli-ohms resistance. Would a two cell at 16 milli ohms have less ability to deliver power than a 5 cell nimh battery? I am building a two cell pack for a 30% airplane and want to be sure that I can deliver ample power source.

Thanks,

Richard

< Message edited by rdb127 -- 6/26/2007 11:34:23 AM >

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Post #: 201

RE: A123Racing Battery Questions - 6/23/2007 11:01:03 PM

biodiversivist

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Joined: 10/8/2006
From: Seattle, WA, USA
Status: offline

Hi Red,

I just sent him an email. Thanks. I use them on my hybrid electric bike. I fried one last year when I got some wires crossed. I fried another this winter when a downpour shorted out something on my electric bike, and this last on was from showing off. I only had two batteries installed in series for 72 volts. Usually I have four (two packs in series hooked in parallel). I gunned the throttle to do a wheely and poof.

Russ

http://www.youtube.com/watch?v=lV4FxzprGfg

(in reply to Red Scholefield)

Post #: 202

RE: A123Racing Battery Questions - 6/24/2007 1:07:05 AM

biodiversivist

Posts: 4
Joined: 10/8/2006
From: Seattle, WA, USA
Status: offline

Red,

Your buddy does not have any at the moment so, anyone else who might have a Dewalt BMS, drop me a line.

Thanks again,

Russ

finleylester@hotmail.com

(in reply to Red Scholefield)

Post #: 203

RE: A123Racing Battery Questions - 6/26/2007 5:01:53 AM

akura2

Posts: 15
Joined: 2/18/2004
From: Paramount, CA, USA
Status: offline

Hey Brian (or anyone that could help me)

I have an ARX540 electric dirtbike (I have the first one in the USA) and I'm having trouble finding a battery pack for it.... the battery area is 70mm x 55mm x 53mm... the bike loves to work with 11.1V and a 5400KV motor... I'm using a Mamba Max 5700 with mine... it seems that size-wise, the 9.9V 2300 seems to be a perfect fit, and it's enough voltage to be more than the starting voltage of 7.4V (which is kinda slow) and the 11.1V that the prototypes ran... Will I have any issues powering my Mamba Max system with these batteries?... Looking to make a puurchase VERY soon so I need an answer ASAP... and do I really need the charger and/or the turbo? (I have several LiPo chargers but I'm not opposed to buying the A123 charger)

< Message edited by akura2 -- 6/26/2007 5:02:12 AM >

(in reply to Red Scholefield)

Post #: 204

RE: A123Racing Battery Questions - 6/26/2007 11:42:29 AM

Richard D Bahmann aka/Wrongway

Posts: 1938
Joined: 1/7/2004
From: Ormond Beach, FL, USA
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Here is another question added to my last post. Can take help on both and would appreciate it.

We have put together a two cell pack for 6.6 v. Is there a way of testing the capacity of the battery pack? Do we charge to 6.6v then cycle to 4 v to see what mAh comes out/goes back in? So far using a Triton Charger on it.

Thanks!

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Post #: 205

RE: A123Racing Battery Questions - 6/28/2007 10:37:49 PM

Brijar

Posts: 16
Joined: 6/28/2007
From: Blue Springs, MO, USA
Status: offline

Is there any way to put a different balancing connector on the Sonic Charger? I bought a Dewalt pack and assembled those cells into two 2s packs and two 3s packs. I just bought a hypersonic charger off Ebay, and I want to use the balancing feature of it, but I don't have an anderson balancing connector. I know that it is possible to buy them on the A123racing website, but I would rather just run up to Radio Shack and get a connector there or something local. Is there a way that I could just cut off the current connector and put my own on it?

Thanx,
Brijar!!!

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Post #: 206

RE: A123Racing Battery Questions - 6/29/2007 1:36:55 AM

Airbike

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Joined: 3/18/2003
From: Walnut, CA, USA
Status: offline

I just use a standard JR/Hitec S servo connector.

For 2 cell pack, remove the outer pins and use the center pin.

For 3 cell pack, remove the center pin and use the outer pins, the error light will flash if the connector needs to be flipped over. Mark the color of the proper orientation and you're good to go.

Works for me (so far)....

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Post #: 207

RE: A123Racing Battery Questions - 6/29/2007 2:22:01 AM

Brijar

Posts: 16
Joined: 6/28/2007
From: Blue Springs, MO, USA
Status: offline

I don't have my charger yet, so I don't know where/how to plug the JR servo connector to. Is there a port built in to the charger, or does it have a lead?

Brijar!!!

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Post #: 208

RE: A123Racing Battery Questions - 6/29/2007 11:17:10 PM

Airbike

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Joined: 3/18/2003
From: Walnut, CA, USA
Status: offline

The Sonic charger has a balancing port w/ 3 pins.

I think the charger only works with the balancing tap inserted into the port. Otherwise, the error light blinks and I assume charging does not take place. I bought a couple of 2 cell packs from A123 Racing and they had a balancing tap with only 1 wire and it went into the center pin of the connector. (presuming the tap is from the center node).

I made a 3S pack from some Dewalt pack cells and the Sonic charger did not work until I put in the balancing taps from the 2 nodes. I tried to buy some balancing taps from A123 Racing but never got a reply to my phone message. But the servo connector fits and I've got plenty of those laying around so I'm fine with that.

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Post #: 209

RE: A123Racing Battery Questions - 6/30/2007 12:36:46 AM

Richard D Bahmann aka/Wrongway

Posts: 1938
Joined: 1/7/2004
From: Ormond Beach, FL, USA
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I have read this entire thread and am interested in actually converting as many of my planes over to these batteries but wonder what ever happend to the manufacturer rep who was candidly answering questions? Are they too busy for us? Before any of you bust my chops why I don't just call them.....got too much on my plate and prefer to read my email at any point in a 24 hour period, which is why I am here. These RCU forums can really be helpful.

Oh well, too many bigger fish in the pond. Maybe I am spoiled by those manufacturers who give "Customer Support" in the interest of furthering their product.

< Message edited by rdb127 -- 6/30/2007 12:42:30 AM >

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Post #: 210

RE: A123Racing Battery Questions - 6/30/2007 12:55:27 AM

Red Scholefield

Posts: 4622
Joined: 12/8/2001
From: Newberry, FL, USA
Status: online

Understand that the hobby market isn't even a blip on the radar at A123. If the technology is as good as claimed, and I have nothing to date with my use of it to believe otherwise, they have their hands full serving consumer and commercial accounts. It the technology takes off for EV use and expands more in the power tool market we will be lucky to still be able to buy DeWalt packs on e-Bay.

quote:

ORIGINAL: rdb127

I have read this entire thread and am interested in actually converting as many of my planes over to these batteries but wonder what ever happend to the manufacturer rep who was candidly answering questions? Are they too busy for us? Before any of you bust my chops why I don't just call them.....got too much on my plate and prefer to read my email at any point in a 24 hour period, which is why I am here. These RCU forums can really be helpful.

Oh well, too many bigger fish in the pond. Maybe I am spoiled by those manufacturers who give "Customer Support" in the interest of furthering their product.

_____________________________

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

(in reply to Richard D Bahmann aka/Wrongway)

Post #: 211

RE: A123Racing Battery Questions - 6/30/2007 1:34:23 AM

Richard D Bahmann aka/Wrongway

Posts: 1938
Joined: 1/7/2004
From: Ormond Beach, FL, USA
Status: offline

Thanks Red, I agree with you.

I was speaking with the owner of TBM yesterday and asked him his take on the 123 batteries. He basically said that nobody had sent him any to review and he was happy with what he had to sell. The cutting edge is defined.

I guess whey you are serving multi billion dollar military contractors and similar accounts you are good to go.

R

_____________________________

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

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Post #: 212

RE: A123Racing Battery Questions - 7/1/2007 8:11:20 AM

JoeCanuck

Posts: 2
Joined: 7/1/2007
From: Calgary, AB, CANADA
Status: offline

Good day. I've been a glow flyer for years but got swept away with the convenience of e-flight. I'm in the process of converting the hangar. I have a couple of DeWalt packs coming. I've made up my own NiMh and NiCd packs forever so assembling a 123 pack holds no fear for me.

Of course, I have some questions. Where does one install the balancer harness into a pack? I plan on using a123 blinky's.

I've been seriously considering a Xtrema charger, (I like the idea of the built in watt meter and the adjustability). I've considered a Balance Pro system but I'm not crazy about the non standard connections. What other charger options are being used...with success?

That's it for the moment...I'm sure I'll have plenty more questions.

Thanks.

(in reply to Richard D Bahmann aka/Wrongway)

Post #: 213

RE: A123Racing Battery Questions - 7/1/2007 7:12:18 PM

akura2

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From: Paramount, CA, USA
Status: offline