A123 20AHr Pouch Cell Battery Build & Info Thread

Batteries, Chargers, and Battery Management Systems.
ejonesss   10 kW

10 kW
Posts: 716
Joined: Aug 31 2008 4:21pm

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by ejonesss » Aug 25 2013 3:22am

at what point does puffing happen on the discharge/charging?



agniusm wrote:I'd say 10C. Something higher and you need cooling. I discharged them at ~210A and temps on the cells went to ~55C
stuff for Even Newer 4 to 24-cell Battery Management System (BMS)
32 lifepo4 cells 16s2p 40138 green cells √
16s2p 40138 based pack built assembled (building electrical equiv to $2000 eonyx system.*

User avatar
oatnet   10 MW

10 MW
Posts: 2341
Joined: Apr 26 2007 3:03pm
Location: SoCal, USA

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by oatnet » Aug 25 2013 8:27am

deVries wrote:
oatnet wrote:Devries where did you end up buying your a123 20ah pouch cells from?
Sorry to say I never got any, ever, though I would like to get 32 confirmed good cells for Rachel's two trikes. (She is disabled, and I'm trying to help her w/battery, etc.)
deVries wrote:I would suggest to continue to follow Doctorbass and his method to package these cells. Your ebike application is not putting much demand on these cells vs their intended car applications usage. Definitely use the principle of KISS. ;)
I am seeing all sorts of advice, input and commentary like the above from you on the whole range of a123 20ah threads, regarding issues about how these cells should be configured, managed and shipped, but you have not even held one of these cells in your hands. In my book that is a problem, simply reading what others have done is no substitute for experience.
Member 117 of 26,000+

153v DUNE BUGGY © 164v Vectrix E-Moto © 72v Norco A-line/x5403 © 60v Specialized Enduro Comp/BMC © 72v x5tracycle © 48v TF IO/BMC © 36v Kepler FrictionDrive © Spot-Welding a123 © Pelican Front Packs © Vectrix Battery Replacement © MORE !!


Image大鸡巴 Motors
Knowledge is acquired through experience, everything else is just information - Albert Einstein
"Cheater?" I'm not competing, I'm Commuting!

deVries   1 MW

1 MW
Posts: 1545
Joined: Jul 10 2008 11:29pm
Location: Solar Powered 3000w Texas

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by deVries » Aug 25 2013 8:46am

oatnet wrote:
deVries wrote:
oatnet wrote:Devries where did you end up buying your a123 20ah pouch cells from?
Sorry to say I never got any, ever, though I would like to get 32 confirmed good cells for Rachel's two trikes. (She is disabled, and I'm trying to help her w/battery, etc.)
deVries wrote:I would suggest to continue to follow Doctorbass and his method to package these cells. Your ebike application is not putting much demand on these cells vs their intended car applications usage. Definitely use the principle of KISS. ;)
I am seeing all sorts of advice, input and commentary like the above from you on the whole range of a123 20ah threads, regarding issues about how these cells should be configured, managed and shipped, but you have not even held one of these cells in your hands. In my book that is a problem, simply reading what others have done is no substitute for experience.
Not necessarily so, since I get information from people like Doctorbass, you, Agniusm, bigmoose, W9BK (and many other experts), I start and study major threads about these subjects such as: Dr.Bass Steveo found 7s3p Module! Awesome Price!!

I have more experience reading/posting about cells and batteries than many people posting or reading, and I've been here reading/posting for 1,000's of hours over 5 years. I have other cell types or form factors in my hands including A123, building batteries from cells, using HK LiPo, using software to test and analyze cells, etc. :twisted:

ejonesss   10 kW

10 kW
Posts: 716
Joined: Aug 31 2008 4:21pm

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by ejonesss » Aug 26 2013 4:31am

on pages 31 to 33 i talk about using compressed air to prevent puffing.

something i never thought of i was told by a friend in the appliance repair business is that if air was used and there would be a short in the battery then it would be like a bomb and could explode so air would not be a good idea.

so probably inerting gas like nitrogen would be ideal except for i dont know if it would react with chemistry of the battery (should there be a rip in the pouches) and could ruin the cells or degrade their performance or such so i think the use of pressure places would be better..

an improvement i can suggestion is if plastic plates cant be used you maybe use sheets of plastic on between the cells and the compression plates to prevent any contact to the metal plates should there be any.




ejonesss wrote:another thing i was wondering with compression is could i get an air tight box with pressure rated terminals like those used on refrigeration compressors and charge the box to the 15 to 25 psi of air or maybe even some inerting gas like nitrogen.
stuff for Even Newer 4 to 24-cell Battery Management System (BMS)
32 lifepo4 cells 16s2p 40138 green cells √
16s2p 40138 based pack built assembled (building electrical equiv to $2000 eonyx system.*

User avatar
oatnet   10 MW

10 MW
Posts: 2341
Joined: Apr 26 2007 3:03pm
Location: SoCal, USA

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by oatnet » Aug 27 2013 5:53pm

deVries wrote:
oatnet wrote:
deVries wrote:
oatnet asks: Devries where did you end up buying your a123 20ah pouch cells from?

Sorry to say I never got any, ever, though I would like to get 32 confirmed good cells for Rachel's two trikes. (She is disabled, and I'm trying to help her w/battery, etc.)
I am seeing all sorts of advice, input and commentary like the above from you on the whole range of a123 20ah threads, regarding issues about how these cells should be configured, managed and shipped, but you have not even held one of these cells in your hands. In my book that is a problem, simply reading what others have done is no substitute for experience.
Not necessarily so, since I get information from people like Doctorbass, you, Agniusm, bigmoose, W9BK (and many other experts), I start and study major threads about these subjects such as: Dr.Bass Steveo found 7s3p Module! Awesome Price!!

I have more experience reading/posting about cells and batteries than many people posting or reading, and I've been here reading/posting for 1,000's of hours over 5 years. I have other cell types or form factors in my hands including A123, building batteries from cells, using HK LiPo, using software to test and analyze cells, etc. :twisted:
1) Starting a thread does not mean you have a clue on the subject. I always though it was odd when you would start a thread about a hot topic other people developing, when you clearly had no knowledge of the subject matter. I just figured you did it to put yourself in the middle of an interesting discussion so you could feel important, didn't realize you also thought it made you smarter.

2) Simply reading other people's posts is NOT a substitute for experience, nor is it suitable background for giving advice.

3) Most of your posts spread disinformation, because you don't have the experience to filter out the incorrect things you have read.

4) I call BS, you are an armchair engineer - let's see a link to those packs you claim to have built. How about a link to your eBikes?

-JD
Member 117 of 26,000+

153v DUNE BUGGY © 164v Vectrix E-Moto © 72v Norco A-line/x5403 © 60v Specialized Enduro Comp/BMC © 72v x5tracycle © 48v TF IO/BMC © 36v Kepler FrictionDrive © Spot-Welding a123 © Pelican Front Packs © Vectrix Battery Replacement © MORE !!


Image大鸡巴 Motors
Knowledge is acquired through experience, everything else is just information - Albert Einstein
"Cheater?" I'm not competing, I'm Commuting!

deVries   1 MW

1 MW
Posts: 1545
Joined: Jul 10 2008 11:29pm
Location: Solar Powered 3000w Texas

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by deVries » Aug 27 2013 9:01pm

deVries wrote:
oatnet wrote:
deVries wrote:
oatnet asks: Devries where did you end up buying your a123 20ah pouch cells from?

Sorry to say I never got any, ever, though I would like to get 32 confirmed good cells for Rachel's two trikes. (She is disabled, and I'm trying to help her w/battery, etc.)
I am seeing all sorts of advice, input and commentary like the above from you on the whole range of a123 20ah threads, regarding issues about how these cells should be configured, managed and shipped, but you have not even held one of these cells in your hands. In my book that is a problem, simply reading what others have done is no substitute for experience.
Not necessarily so, since I get information from people like Doctorbass, you, Agniusm, bigmoose, W9BK (and many other experts), I start and study major threads about these subjects such as: Dr.Bass Steveo found 7s3p Module! Awesome Price!!

I have more experience reading/posting about cells and batteries than many people posting or reading, and I've been here reading/posting for 1,000's of hours over 5 years. I have other cell types or form factors in my hands including A123, building batteries from cells, using HK LiPo, using software to test and analyze cells, etc. :twisted:
oatnet wrote: 1) Starting a thread does not mean you have a clue on the subject. I always though it was odd when you would start a thread about a hot topic other people developing, when you clearly had no knowledge of the subject matter. I just figured you did it to put yourself in the middle of an interesting discussion so you could feel important, didn't realize you also thought it made you smarter.

2) Simply reading other people's posts is NOT a substitute for experience, nor is it suitable background for giving advice.

3) Most of your posts spread disinformation, because you don't have the experience to filter out the incorrect things you have read.

4) I call BS, you are an armchair engineer - let's see a link to those packs you claim to have built. How about a link to your eBikes?

-JD
JD, oatnet, please stop posting OT ad hominem personal attacks in this thread. Twice is enough. Next time you repeat this crap in any thread it just shows what a time waster you are... sicko!

You posted this crap "just above" a short time after I found you to be hypocritical and high-horse riding in another thread, and then you unleashed a big pile of crap there too and, now, here too. Trolling, you are! STOP.

Here is where the recent trouble started and continued:

I'm pointing out JD's/Oatnet's hypocritical post

Btw JD/Oatnet, why don't you do something useful and either post where I'm misleading people with disinformation in a specific thread staying ON TOPIC (not hijacking OT), or, better yet, please spend your time posting useful information advancing "the cause" rather than focusing specifically on me. ;)

Please put me on your ignore list too, but, also, please stop wasting everyone's time here with this BS. Use the PM button to 'talk trash' with your buddies... :lol:

999zip999   100 GW

100 GW
Posts: 9467
Joined: Jan 10 2010 1:40pm
Location: Dana Point So. Cal

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by 999zip999 » Aug 28 2013 12:09am

Devires how many voltpheakes do you own ?

deVries   1 MW

1 MW
Posts: 1545
Joined: Jul 10 2008 11:29pm
Location: Solar Powered 3000w Texas

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by deVries » Aug 28 2013 2:05am

999zip999 wrote:Toliet.
Give a break as go away.















T
Ypedal wrote:i just deleted a whole bunch of crap form this thread.... everyone.. and i mean EVERYONE stay on topic and keep the flame wars from past sales gone wrong out of this thread.

thank you.
Ypedal just a few days ago had to delete a few trashy posts like this from you a few days ago. Just had to pull the trigger again, didn't you, since JD/Oatnet gave you inspiration. What a great "character" you are...

User avatar
agniusm   10 MW

10 MW
Posts: 2420
Joined: Apr 16 2011 3:06pm
Location: Lithuania, Zarasai
Contact:

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by agniusm » Aug 28 2013 2:33am

deVries, i think Oatnet has a point here. I have pointed out this a year ago when i was playing with 20AH cells. Too much posting giving out advice, too much asking to do one thing or another from your part. I haven't seen a single post of the stuff you made, cell you have tested, idea that was backed up in practice and explained here. You take all the knowledge from others and shed information to others without thinking that those who do the work might be wrong in the end as well.
A lot of vaporware lately. Few pages on this thread is talk about nothing and ejonesss follows what you did last year - going through threads, posting, posting, posting when there is no benefit that others members might have. Have you seen a reputable member that we all know about post like this?
I think you boys need to be more conservative, spend less time here and more in your workshop,
deVries wrote:Not necessarily so, since I get information from people like Doctorbass, you, Agniusm, bigmoose, W9BK (and many other experts), I start and study major threads about these subjects such as: Dr.Bass Steveo found 7s3p Module! Awesome Price!!
I have more experience reading/posting about cells and batteries than many people posting or reading, and I've been here reading/posting for 1,000's of hours over 5 years. I have other cell types or form factors in my hands including A123, building batteries from cells, using HK LiPo, using software to test and analyze cells, etc. :twisted:
..and this post is as bad as it can get.

ejonesss, have you thought about your pressurized container? Have you thought through how you would achieve that and how much additional cost that would involve? I think not.
Stop posting BS and go do some experimenting!

deVries   1 MW

1 MW
Posts: 1545
Joined: Jul 10 2008 11:29pm
Location: Solar Powered 3000w Texas

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by deVries » Aug 28 2013 3:11am

agniusm wrote:Too much posting giving out advice, too much asking to do one thing or another from your part. I haven't seen a single post of the stuff you made, cell you have tested, idea that was backed up in practice and explained here. You take all the knowledge from others and shed information to others without thinking that those who do the work might be wrong in the end as well.
Oatnet is full of it, when he suggests I'm posting misleading disinformation! BS. Prove it! Instead, he rants here without a shred of evidence. Of course, this has more to do with the fact I called him out on a very hypocritical attack he pointed at someone else using the words "murder" and "crime" and such, when he broke the same exact laws/rules the year before, so he comes over 'here' now to trash this thread directing his hostility at me here too. That's a troll for ya.

No one has "to qualify" here to be able to post. You were/are selling A123 assembly kits, so it was very reasonable for me to ask you relevant questions about your kit design, etc. I believe I was the first customer to send you payment on the size kits that I bought two of. Plus, I did give you one design change idea that you accepted and said you would change on your next offering. I think I helped you.

Of course, here I go again to have to post OT to explain myself in a thread about another subject. Can we please stay ON TOPIC in this thread, PLEASE. Why didn't you just PM me about this???
Last edited by deVries on Aug 28 2013 3:48am, edited 1 time in total.

User avatar
agniusm   10 MW

10 MW
Posts: 2420
Joined: Apr 16 2011 3:06pm
Location: Lithuania, Zarasai
Contact:

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by agniusm » Aug 28 2013 3:33am

I was observing the numbers on these cells. The one which is on the tab, starting SHB, SHA(for USA cells). I have not seen a photograph of a cell with different number than 10 or 11. Could that indicate manufacturing year? Again month should be important in this equation too.

P.S. deVries. My observation. Talking is one thing, doing is another. There were a lot of suggestions and if you list most of them, sure there will be an idea that might work ;)

deVries   1 MW

1 MW
Posts: 1545
Joined: Jul 10 2008 11:29pm
Location: Solar Powered 3000w Texas

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by deVries » Aug 28 2013 3:44am

agniusm wrote:I was observing the numbers on these cells. The one which is on the tab, starting SHB, SHA(for USA cells). I have not seen a photograph of a cell with different number than 10 or 11. Could that indicate manufacturing year? Again month should be important in this equation too.
I contacted Erik at the A123 USA sales website to ask him about this. (Erik owns that business.) He said he will forward this question to A123 and maybe get an answer.

Also, I have learned from an A123 employee that he can not reveal this information, so I don't know whether Erik will get an answer either.

I do know W9BK posted that it might be possible to decode how to read the year of manufacture, but he is not going to reveal how to do it.

Maybe you can figure it out? I hope someone can do that. :)
===================================================

P.S. Agniusm, I suggest you directly point out any "bad information" posts I make, and don't do like Oatnet/JD just using Ad Hominem attacks and tactics. YOU & Oatnet & Ohzee have NO IDEA that I'm experienced with DOING too. Especially, battery knowledge & doing! I suggest you guys get down off your high-horse riding and become civilized. Stay On Topic in this thread, PLEASE. Thank you!

Here is my idea that helped you, agniusm! :)

A123 AMP20M1HD-A Battery pack kit
deVries wrote:Does it cost much more to allow balance traces to take 4A-6A vs 3A??? How much? If not, then I think it's much better to design for 4A-6A. 8)
agniusm wrote:OK, have changed traces to 2mm for 6 amps. Got the bolt holes reduced from 3.5mm to 3.1mm for less play while assembling. Need to figure out how to round the edges on soft.
Last edited by deVries on Aug 31 2013 1:29pm, edited 1 time in total.

ejonesss   10 kW

10 kW
Posts: 716
Joined: Aug 31 2008 4:21pm

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by ejonesss » Aug 28 2013 8:29am

he does not have to reveal how to decode it he could decode and tell ys what the date is and we then figure it out.

deVries wrote:
agniusm wrote:I was observing the numbers on these cells. The one which is on the tab, starting SHB, SHA(for USA cells). I have not seen a photograph of a cell with different number than 10 or 11. Could that indicate manufacturing year? Again month should be important in this equation too.
I contacted Erik at the A123 USA sales website to ask him about this. (Erik owns that business.) He said he will forward this question to A123 and maybe get an answer.

Also, I have learned from an A123 employee that he can not reveal this information, so I don't know whether Erik will get an answer either.

I do know W9BK posted that it might be possible to decode how to read the year of manufacture, but he is not going to reveal how to do it.

Maybe you can figure it out? I hope someone can do that. :)
stuff for Even Newer 4 to 24-cell Battery Management System (BMS)
32 lifepo4 cells 16s2p 40138 green cells √
16s2p 40138 based pack built assembled (building electrical equiv to $2000 eonyx system.*

User avatar
ohzee   1 MW

1 MW
Posts: 1715
Joined: Jul 20 2011 1:13pm
Location: Columbus Ohio USA

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by ohzee » Aug 28 2013 9:07am

I am going to agree with oatnet & agniusm here re: the group buy thief.

Regurgitating what other people have said is no stand in for experience.

At the least people need to realize that if they decide to take your advice.

Personally I wish you'd go back to the hole you had been in the last 6 months, but
Ill make do with the ignore feature from now on.

User avatar
Spacey   100 kW

100 kW
Posts: 1463
Joined: May 15 2010 9:38am
Location: United Kindom
Contact:

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by Spacey » Aug 28 2013 9:17am

To get back on topic from this handbags at dawn deviation :wink: I have been stripping down my bought packs and personally and very painstakingly rebuilding them using resin board for protection with very high quality silicon 200 deg C resistant no conductive. Really good but very expensive stuff, fill in all the ruts and gaps so as to add support and anti vibration help.

New cable applied i.e 10 AWG Silicon Cable with 20AWG BMS Leads, I know actually have decent battery packs that are giving out 19.5AH. Next time I will build the damn things myself, I did lose some packs though from a certain vendor that had solder in between the cells piercing them rendering them puffed and useless.

Out of the packs that I paid with paypal using my credit card and the ones which were direct bank transfer...guess which ones were the good stuff lol....never buy from China without some sort of protection.

These are picks from the Victpower cells, just in case people think I am too hard on them! These were all set fire to, overcharged and ripped up whilst charged....no fire. But they were disposed and not used...big waste of money and lesson learned.
1.JPG
Victpower 1
1.JPG (102.28 KiB) Viewed 2508 times
2.JPG
Victpower 2
2.JPG (81.17 KiB) Viewed 2508 times
3.JPG
Victpower 3
3.JPG (79.9 KiB) Viewed 2508 times
http://www.custom-ebikes.com is my new Ebike company serving the Uk and Europe
Free Uk shipping over £49.99

deVries   1 MW

1 MW
Posts: 1545
Joined: Jul 10 2008 11:29pm
Location: Solar Powered 3000w Texas

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by deVries » Aug 28 2013 9:23am

ohzee wrote:I am going to agree with oatnet & agniusm here re: the group buy thief.

Regurgitating what other people have said is no stand in for experience.

At the least people need to realize that if they decide to take your advice.

Personally I wish you'd go back to the hole you had been in the last 6 months, but
Ill make do with the ignore feature from now on.
Ypedal wrote:i just deleted a whole bunch of crap form this thread.... everyone.. and i mean EVERYONE stay on topic and keep the flame wars from past sales gone wrong out of this thread.

thank you.
Ohzee, you're one of Oatnet's big buddies. You bought the A123 20Ah cells from him. Also, you are completely wrong, when you write "re: the group buy thief".

Furthermore, you did not tell the truth when you posted in the thread linked below too.

RESOLVED! ES member fell very ill & is working this out :)

What's even worse about your character flaws is I tried to clear this up with you PRIVATELY over a week ago by PM. You simply ignored the PM and never replied. (At least Oatnet has the decency to not call me a thief.)

Experience? I have plenty of experience "doing" regarding testing battery cells and assembly techniques. Besides, that's BS, when you can't point specifically to misleading information I'm posting. I certainly will not waste my time with you or Oatnet "to prove" anything.
Last edited by deVries on Aug 31 2013 10:35pm, edited 2 times in total.

User avatar
Spacey   100 kW

100 kW
Posts: 1463
Joined: May 15 2010 9:38am
Location: United Kindom
Contact:

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by Spacey » Aug 28 2013 9:29am

Goodness sake people...let's get back on topic or I'm just not going to bother. :evil:
http://www.custom-ebikes.com is my new Ebike company serving the Uk and Europe
Free Uk shipping over £49.99

User avatar
arkmundi   1 GW

1 GW
Posts: 3149
Joined: Jul 08 2012 11:14am
Location: Worcester, MA USofA

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by arkmundi » Aug 28 2013 12:12pm

Spacey wrote:These are picks from the Victpower cells, just in case people think I am too hard on them! These were all set fire to, overcharged and ripped up whilst charged....no fire. But they were disposed and not used...big waste of money and lesson learned.
Thanks for the pics! Yea, there was a moment in time when some good cells could be had, but that moment passed some time ago. Of the 20 cells I purchased: 1> 12S are working fine in my pack, 2> 5 cells died and were removed, and 3> I have 3 cells left in my stash. Of the dead cells, only one had that black splotching and puffing. wb9k said that's an obvious sign of failure in the envelope and leakage of the electrolyte. I'm hoping that sometime in the next 6 months, someone will take me up on my A123 AMP20 Cells, new, legit, factory direct! request, so I can replenish my stash. The original and ongoing design is a forever pack where I just keep replacing cells as they die! A full carton of 20 is just too many for me. :mrgreen:

999zip999   100 GW

100 GW
Posts: 9467
Joined: Jan 10 2010 1:40pm
Location: Dana Point So. Cal

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by 999zip999 » Aug 28 2013 12:33pm

It's hard to turn a 70.00usd. cell into a 18.50 usd cell or lower. I watch my cells enough to have a fill for them. But I tought I had a love afair with my 530 konion cell, Gave them a salt bath. many hunderds of cells. Moving on as I have a new love is the A123 20ah. Sorry April. If i had money i ask for a new pack maybe 16s for weight and MNC. Or what's cheap.

999zip999   100 GW

100 GW
Posts: 9467
Joined: Jan 10 2010 1:40pm
Location: Dana Point So. Cal

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by 999zip999 » Aug 28 2013 12:35pm

It would be good to earn your OAT'S. Then post. Thanks J.D.

User avatar
ohzee   1 MW

1 MW
Posts: 1715
Joined: Jul 20 2011 1:13pm
Location: Columbus Ohio USA

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by ohzee » Aug 28 2013 1:00pm

I did a ride yesterday on my 24s pack I built and it's still going strong.

My 16s pack is also going strong. Out of all the cells I purchased I think I
only had 1 maybe 2 fail and that was pretty much right away.

I still have 4 spares which I made a 4s battery that I use for 12v applications.

I always use a BMS with these as I just like the plug and play functionality.

User avatar
docnjoj   100 GW

100 GW
Posts: 5787
Joined: Sep 29 2007 5:26pm
Location: Fairhope AL

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by docnjoj » Aug 28 2013 1:08pm

I got some of the earliest Victpower full tab cells. I have 2 spares and run 12S. So far so good but it would be nice to see these cells at reasonable cost so they could be replaced. I'm getting about 18 AH from my split pack and running at 12 -13 AH for our 20 mile rides. Most cells had a "B" in the serial number with a couple of "A"'s. I can't tell the difference in performance.
otherDoc
E-bike stable at our house

Steintrike Mad Max full suspension trike rear Cute 100H going on: Whoops, Cute wheel broke but I fixed it.
Sun USX delta trike EbikeKit small geared front wheel sort of front suspension for wife

Agniusm/A123 AMP 20 36 volts on the Steini has been taken off.
2x16000 Multisport from HK now gone as they died after 2 years
New Luna 10S bottle battery 13.6AH now on mine
Relatively New 10S4Px2 for wife's bike giving 20ah @ 40 volts home made Panasonic from Tumich. BMS's rule.

User avatar
arkmundi   1 GW

1 GW
Posts: 3149
Joined: Jul 08 2012 11:14am
Location: Worcester, MA USofA

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by arkmundi » Aug 28 2013 1:11pm

docnjoj wrote:.... I have 2 spares and run 12S. So far so good but it would be nice to see these cells at reasonable cost so they could be replaced...
I hope to solve this issue before I run out of my 3 spares and am open to all suggestions. What is a "reasonable cost?" I'm car-free and can not manage these days without my ebike. So when I'm down to 1 spare, something will need to give.

deVries   1 MW

1 MW
Posts: 1545
Joined: Jul 10 2008 11:29pm
Location: Solar Powered 3000w Texas

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by deVries » Aug 28 2013 1:30pm

arkmundi wrote:
docnjoj wrote:.... I have 2 spares and run 12S. So far so good but it would be nice to see these cells at reasonable cost so they could be replaced...
I hope to solve this issue before I run out of my 3 spares and am open to all suggestions. What is a "reasonable cost?" I'm car-free and can not manage these days without my ebike. So when I'm down to 1 spare, something will need to give.
You could buy 7-8 of the 26650 A123 cells to put in parallel/7-8P, and remove the bad 20Ah cell. Then, run the wiring to the empty tab slots to connect those in series with the 20Ah cells with an inserted dummy cell to fill the void thickness of the removed cell. Rinse and repeat as needed.

These cells are readily available and are on sale at the A123 website for the B-grade for about $5 ea.

User avatar
bigmoose   100 MW

100 MW
Posts: 2682
Joined: Aug 06 2009 3:05pm
Location: North coast USA
Contact:

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Post by bigmoose » Aug 28 2013 1:33pm

deVries wrote:These cells are readily available and are on sale at the A123 website for the B-grade for about $5 ea.
Note: we have reasonable assurance that the so called B grade are M1-A production to the previous spec. The new production are M1-B with a slightly higher Ah rating.
"Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God..." all the best, Dave

Post Reply