RE: A123Racing Battery Questions  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> A123Racing Support >> RE: A123Racing Battery Questions
Page: <<   < prev  2 3 4 [5] 6 7 8 9 10 11   next >   >>  

Login
Message << Older Topic   Newer Topic >>
RE: A123Racing Battery Questions - 12/23/2006 11:59:37 AM   
oldpilot


 

Posts: 32
Joined: 1/1/2003
From: Church Point, AUSTRALIA
Status: offline 		IN REGARD TO YOUR SHIPPING POLICIES.

I buy lots of accessories and batteries from the USA and there seems to be a growing move to shipping by USPS International Priority Airmail to International destinations such as Australia, where I live. USPS shipping is fast and inexpensive to the point where on my orders I now state. " Do NOT on any account ship by Fedex or UPS". If they won't ship by USPS I don't use them ----there are plenty of other suppliers who will.
In your case you have the market monopoly of this new battery technology, but I can't see any reason why you cannot ship by USPS to Australia. You don't need any special permission to do so. If Li Poly batteries are able to be shipped without problem, I'm sure A123 batteries can be too.

Cheers. Patrick.

(in reply to rltucker)
       Post #: 101

RE: A123Racing Battery Questions - 12/23/2006 4:11:55 PM   
everydayflyer



Posts: 854
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		I also am interested in the double number of tabs. Each cell has two ends so four tabs per cell would perhapd mean a double layer(2 per end). Wouldn't thicker tabs be better than layering them. Copper would be better than steel it would seem.
I did not that the tabs appear to be larger / longer on the cells from 123 as compared to the cells from A123 Racing and the tabs from A123 Racing are a touch longer than the ones on the DeWalt packs.
Yes I know A123 Racing do not endorse using cells from DeWalt packs however as they also do not endorse using any charger other than theri own which is limited to 3S packs I fail to see a major difference.

I harvest cells from DeWalt 36 V packs, build my own packs in the configurations I need and charge with a modified Astro Flight 109 LiPoly charger and use Thunder Power and Hyperion Balancers.
Life is good ,I love the cells just wish like others marketing was better.

Look what I found

http://www.a123systems.com/html/applications.html

Cell with 4 tabs however when you clink on Go Photo changes.

Charles

Attachments
Click to see fullsize image.
Click for fullsize


< Message edited by everydayflyer -- 12/23/2006 9:22:18 PM >

(in reply to rltucker)
       Post #: 102

RE: A123Racing Battery Questions - 12/28/2006 10:51:26 PM   
Warcloud


 

Posts: 4
Joined: 3/1/2006
From: Danbury, CT, USA
Status: offline 		Are you planning on selling packs for recievers... I would like to use them for my 1/8 scale truggy and buggy... and would I need a voltage regulator.

(in reply to everydayflyer)
       Post #: 103

RE: A123Racing Battery Questions - 12/29/2006 6:43:27 AM   
rltucker


 

Posts: 8
Joined: 9/7/2006
From: Tulsa, OK, USA
Status: offline 		This message is for Red Scholefield.

In your post of December 17 you mentioned harvesting A123 cells from DeWalt 36 Volt packs. Do those packs have only 10 cells in series, or 20 cells in a 10S2P arrangement?

I'm wondering how you get 4S2P packs for only $80. The lowest price for the 36 Volt packs that I can find is at Amazon.com where the price is $164.99 with free shipping.

Bob Tucker

(in reply to Red Scholefield)
       Post #: 104

RE: A123Racing Battery Questions - 12/30/2006 3:17:29 AM   
everydayflyer



Posts: 854
Joined: 8/21/2005
From: Buchanan, GA, USA
Status: offline 		Not Red however DeWalt 36 Volt 10 cells in series available on E Bay auction.
These are replacement / extra power packs for the DeWalt 36V cordless power tools.

I have purchased 3 at between $85 and $95 each plus approx. $10 shipping .

< Message edited by everydayflyer -- 12/30/2006 3:18:25 AM >

(in reply to rltucker)
       Post #: 105

RE: A123Racing Battery Questions - 12/30/2006 3:44:46 AM   
rltucker


 

Posts: 8
Joined: 9/7/2006
From: Tulsa, OK, USA
Status: offline 		Thanks to everydayflyer... that is good information.

Bob

(in reply to everydayflyer)
       Post #: 106

RE: A123Racing Battery Questions - 12/31/2006 12:16:08 AM   
Marv829


 

Posts: 28
Joined: 5/23/2004
From: Worthington, IA, USA
Status: offline 		Maybe for a NEW YEARS celebration, Brian@A123Racing will put the developers kits on sale for say $50.
(We can hope anyway)

.......................Happy New Year.........................

< Message edited by Marv829 -- 12/31/2006 12:30:16 AM >

(in reply to rltucker)
       Post #: 107

RE: A123Racing Battery Questions - 1/4/2007 3:58:37 PM   
madmoony


 

Posts: 10
Joined: 1/4/2007
From: Straelen, GERMANY
Status: offline 		Hello,my name is Burkhard and i am a german A123 cell user.I'm using them in a 6s2p configuration in my Mono 2 Speedboat.For better handling and easier charge i splitted them in 2 times 3s2p.
Everything works fine but i have a question to Brian (or anybody else)about the configuration whitch is best for those cells.
I have build up 4 times 3s1p and fitted them together as 2 times 3s2p.
We discussed here the idea ,it's maybe better for them to build up 6 times 1s2p and then build up the 2 times 3s2p.
The difference is small but maybe importand if high currents are used to charge the 3s2p configuration.
I use at the moment 20 Amps to recharge them in about 13 minutes each.

So,do anybody know what is the better solution?It's easy for me to make the nessesary interconections to change them in a all paralell configuration as mentioned before.

Thanks for your help in advance and sorry for the "German English"

Burkhard

(in reply to Marv829)
       Post #: 108

RE: A123Racing Battery Questions - 1/4/2007 5:21:14 PM   
A123 Racing


 

Posts: 101
Joined: 8/25/2006
From: Hopkinton, MA, USA
Status: offline 		Hello Burkhard,

The best way to configure your pack for charging would be to have it as a 6S2P. This negates the losses created when using interconnects, but it is understandable if your charger will not charge such a pack. I think they way you have it configured as two 3S2P packs is the best way to go. It would be a good idea to check the balance of the pack once in a while (measure the voltage of each cell after charge). If any cell is higher you can drain it down to match the others, if it is lower then charge that cell individually. This will help ensure a long lifetime for your pack.

Please let me know if you have any other questions.

Brian



(in reply to madmoony)
       Post #: 109

RE: A123Racing Battery Questions - 1/4/2007 6:33:53 PM   
madmoony


 

Posts: 10
Joined: 1/4/2007
From: Straelen, GERMANY
Status: offline 		Thanks for that fast reply.Yes in deed my charger can only do it's job on a 3s configuration.But the question was a little different...
In a 3s2p pack there are normaly no conections between the paralell cells.Only at the endings the two 3s1p are connected together.So my question was if it's better to make all 4 conections instead of only the two at the ends of the packs.

i try to figure this out:

this is the normal 3s2p version,only connected at the ends

I===II===II===I
|....................|
I===II===II===I

and this is the other 3s2p version ,also connections between the cells

I===II===II===I
|.....|......|......|
I===II===II===I

I think this should help to hold the cells in balance more efficent,because it will act like as there are only 3 bigger cells instead of 6 individual cells

have you understood my question ?


Grz Burkhard

< Message edited by madmoony -- 1/4/2007 6:38:23 PM >

(in reply to A123 Racing)
       Post #: 110

RE: A123Racing Battery Questions - 1/5/2007 3:46:56 PM   
madmoony


 

Posts: 10
Joined: 1/4/2007
From: Straelen, GERMANY
Status: offline 		Hmm,nobody an idea?
Whats the way you have designed the 3s2 or 4..5..6s2 packs ? With or without interconections?

Burkhard

(in reply to madmoony)
       Post #: 111

RE: A123Racing Battery Questions - 1/5/2007 4:59:37 PM   
modifyit15


 

Posts: 49
Joined: 12/9/2004
From: Wilmington, NC, USA
Status: offline 		does any body know if you can run the turbo packs in serise

_____________________________

modify everything!!!!

(in reply to madmoony)
       Post #: 112

RE: A123Racing Battery Questions - 1/5/2007 5:42:50 PM   
rammar


 

Posts: 26
Joined: 1/8/2003
From: wichita, KS, USA
Status: offline 		I'm building a Super Sportster 60 for electric and have purchased the power system which consists of the MPI Combo-60 (HC5030-390 motor/PHHV45 esc/13x8E prop or what works best) I expect the aircraft to weigh somewhere in the 11-14 lb range but trying to stay lighter. Specs are: Current,Amps;45/ Watts Range 1100-1200/Thrust oz 182/System Weight 17oz/ Suggested Battery 4S5000x2 (8S).

That's alot of LIPO batteries and expense! Can you suggest a setup using a123 batterys?

(in reply to elhepilot)
       Post #: 113

RE: A123Racing Battery Questions - 1/5/2007 10:59:51 PM   
A123 Racing


 

Posts: 101
Joined: 8/25/2006
From: Hopkinton, MA, USA
Status: offline 		Hello Burkhard,

Our 2S2P packs are made similarly to the way you show in your second “Picture” with interconnects at each cell. This does help them stay balanced with each other.

Modifyit,

The turbo modules can be used in series however you still need to make sure you follow the power use guidelines in the instructions. You will want to monitor the temperature for the first few runs to make sure it is not getting to hot.

Rammar

For your application you would want to look at a 5S2P x 2 configuration. The pack voltage will be 16.5V nominal and around 14.5V under a 45 amp load. Total weight of the pack will be around 25 oz. A bit heavier but it will be capable of a lot more power if demanded of it. 3 developer kits (12 cells) from www.a123racing.com will be enough cells and will cost $198.

Please let me know if you have any more questions.

Brian


(in reply to rammar)
       Post #: 114

RE: A123Racing Battery Questions - 1/6/2007 3:07:30 PM   
madmoony


 

Posts: 10
Joined: 1/4/2007
From: Straelen, GERMANY
Status: offline 		Thank you Brian,thats helpfull information.

One more question,what is the maximum CONTINUOS currend you can get from one full charged cell untill its empty in one go,without cooling ?
I tested it with 40 Amps but i reach a temperature about 70 degrees. the starting point was 21 degrees.
I am talking about a constand currend discharge from full to empty in one go.
The spec. says 30C cont. ,that means around 70 Amps.

I haven't tryed this because of the high temperature i have reached with 40 Amps.

Grz Burkhard

(in reply to A123 Racing)