RE: A123Racing Battery Questions (Full Version)

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Richard D Bahmann aka/Wrongway -> RE: A123Racing Battery Questions (6/23/2007 10:57:54 PM)

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




biodiversivist -> RE: A123Racing Battery Questions (6/23/2007 11:01:03 PM)

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



biodiversivist -> RE: A123Racing Battery Questions (6/24/2007 1:07:05 AM)

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



akura2 -> RE: A123Racing Battery Questions (6/26/2007 5:01:53 AM)

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)

[IMG]http://img113.imageshack.us/img113/145/arx540pk8.jpg[/IMG]



Richard D Bahmann aka/Wrongway -> RE: A123Racing Battery Questions (6/26/2007 11:42:29 AM)

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!



Brijar -> RE: A123Racing Battery Questions (6/28/2007 10:37:49 PM)

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!!!



Airbike -> RE: A123Racing Battery Questions (6/29/2007 1:36:55 AM)

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)....



Brijar -> RE: A123Racing Battery Questions (6/29/2007 2:22:01 AM)

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!!!



Airbike -> RE: A123Racing Battery Questions (6/29/2007 11:17:10 PM)

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.



Richard D Bahmann aka/Wrongway -> RE: A123Racing Battery Questions (6/30/2007 12:36:46 AM)

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 Scholefield -> RE: A123Racing Battery Questions (6/30/2007 12:55:27 AM)

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.




Richard D Bahmann aka/Wrongway -> RE: A123Racing Battery Questions (6/30/2007 1:34:23 AM)

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



JoeCanuck -> RE: A123Racing Battery Questions (7/1/2007 8:11:20 AM)

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.



akura2 -> RE: A123Racing Battery Questions (7/1/2007 7:12:18 PM)

Just in case my question goes unanswered in the turbo thread:

"I understand that you guys aren't selling the turbo module separately because you don't want to run the risk of someone hooking it up to another type of battery... but I own the 9.9v 2300 pack and I'd like to be able to buy the turbo module if I want.... would you sell one to ME?

do I need to show you my name or proof of purchase in your system?

I didn't buy it when I got the battery and charger because I didn't think I was going to need it right away... but I'd like to have the option of getting it when I want..."


Thanks

Jimmy



Brijar -> RE: A123Racing Battery Questions (7/1/2007 7:18:35 PM)

I'm going to use a Hypersonic A123 charger from [url=www.a123racing.com/soniccharge]A123racing[/url]. It will do 10 amps, but only 2 or 3 cells at a time:(, but I will only be running 2 or 3 cells in my Rustler(truck) anyway. It also only costs $100 :D[sm=thumbs_up.gif].

As for the balance hook up, there used to be a picture, but that forum had a major server crash and had to start over :(. I'll draw one up real quick...

(15 minutes later[sm=sleeping.gif]...)
TA DA!
[IMG]http://img266.imageshack.us/img266/7941/a123balancejb2.png[/IMG]
Oh yeah, I forgot to indicate that on the black balancing connectors, the pins are labled:
Top = 1
Middle = 2
Bottom = 3

I don't have any Anderson balancing connectors, so I don't know if the pins are labled or anything, but just in case;).

Brijar!!!



OCR99 -> RE: A123Racing Battery Questions (7/2/2007 12:13:31 AM)

I just got started with 123 s i have a extrema and use 123 blinky a diagrame will come with balancer
Rick



JoeCanuck -> RE: A123Racing Battery Questions (7/2/2007 5:29:25 AM)

Thanks for the info...It's about what I figured but it's good to know for sure. I'll probably go the xtrema route...I still have lipo cells and I like having all the info.



Tex Gehman -> RE: A123Racing Battery Questions (7/2/2007 2:57:44 PM)

Red: You've stated that you're using the cells in Solderless Power Tubes. I have some on order and wonder if/how you balance the cells. Or if it is important enough to be concerned. Thanks, Tex.



Brijar -> RE: A123Racing Battery Questions (7/3/2007 3:42:33 AM)

On a 3s pack, if you look at the balancing connector from the front (end that goes into charger) with the little hump/clip thingy on top, is the white wire on the left side or the right side? If you don't know what I mean, I'm trying to figure out which pins the two balancing connectors need to be in. Is white on the left or the right?

Thanx,
Brijar!!!



Red Scholefield -> RE: A123Racing Battery Questions (7/3/2007 1:24:48 PM)


quote:

ORIGINAL: Tex Gehman

Red: You've stated that you're using the cells in Solderless Power Tubes. I have some on order and wonder if/how you balance the cells. Or if it is important enough to be concerned. Thanks, Tex.


I use the Power Tubes when I cannot simply fold over the 4 end cells from a DeWalt Pack into 2 2cell sticks, using the existing welded interconnects. I feel that balancing LiPo cells is well worth the effort. I use CellPro pigtail available from FMA. CellPro is the best balancing charger I have run into for the price, and it will handle up to 4 cells charging at 3 Amps (4 amps for 3 cell packs).



DLS II -> RE: A123Racing Battery Questions (7/3/2007 4:33:24 PM)

Tex, the new a123 spts come with shotgun tubes so you don't have to heat shrink the whole pack. Breakdown is easy and quick. Break the pack down to balance. Don



Tex Gehman -> RE: A123Racing Battery Questions (7/3/2007 4:58:22 PM)


quote:

ORIGINAL: DLS II

Tex, the new a123 spts come with shotgun tubes so you don't have to heat shrink the whole pack. Breakdown is easy and quick. Break the pack down to balance. Don


Thanks, Don, that's what I suspected. Because you have to break them down to check individual voltage, how often do you do that? T.



DLS II -> RE: A123Racing Battery Questions (7/3/2007 6:36:28 PM)

When I got my cells in Dec. 06 I asked the same question of Pete at MEC. He replied that he had yet to find an out of balance condition in his packs. He said also you could charge the pack, break it down, check the cells individually and if necessary charge a low cell. I got the impression that you would not have to do this very often. Don



Red Scholefield -> RE: A123Racing Battery Questions (7/3/2007 10:02:34 PM)

quote:

ORIGINAL: DLS II

When I got my cells in Dec. 06 I asked the same question of Pete at MEC. He replied that he had yet to find an out of balance condition in his packs. He said also you could charge the pack, break it down, check the cells individually and if necessary charge a low cell. I got the impression that you would not have to do this very often. Don


Just add a balancing connector when you make up the power tube packs, very easy. I have all of mine with CellPro balancing connector and I can tell you that balancing is important - My set up goes into balance mode about every 5 or 56 charge cycles, not far out of balance, but enough for the CellPro to think it should balance anyway. About 90 cycles on 2 4S packs.



Tex Gehman -> RE: A123Racing Battery Questions (7/3/2007 10:45:38 PM)

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.



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