A123 cells galore..
 

Ebay auctions

$70 for 12 cells, I make that $5.83 a cell, plus ~$20 shipping. If you can find a better deal than that, I'll eat my socks. :yes:

Now only if they weren't so big. And heavy. And if they had better capacity. And if only they came assembled. Then this would be a steal!:yes:

Can they be flattened down so they match normal lipo form factor?

Woot! Thanks Neil! :yipi: I've been waiting for a deal to come along. If I could afford it I'd buy a few packs... but 12 will do for now.

LOL @ BrianG- I suppose you could hit them with a hammer, but that might not do them much good. Its just a shame they only really fit emaxxes and 1/5 scale stuff, but then again, everyone has an emaxx dont they? :wink:

No.... .. . :cry:

Good deal. Are these genuine A123 cells or some chinese knockoffs?

They bear the copywrighted A123 Systems logo, so I hope for the seller's sake that they're genuine.

I have a 50 ton press... I can flatten them to any size you want... no guarantee they still work when done though. :lol:

Just run 1p, they are like 70c cells right? I am sure the voltage drop is not that bad...:whistle:

Says those cells are 10C, 70A cont. Not sure how they got that- If they were 10C wouldn't you get 23A cont? If they do deliver 70A cont, the cells should be about 30.4C.

I think they are referring to a 10c charge rate. I think.:neutral:

Says 10C discharge...

hmmm... I think that's for testing the life span, not the maximum continuous rating.

"70A continuous discharge
120A, 10 sec pulse discharge"

70 ................120
2.3 = 30.4c....2.3 = 52.2c

could you not mount the cells vertically in buggy/truggy trays?

You probably could mount them vertically, but it would be a tight fit. An a123 cell is 25mm in diameter iirc and a standard battery tray is about 50x150 so you would have to run a 6s2p pack, which would be perfect for this ebay listing.

You'll need a new charger too, that is one of the two problems. You need a different charger and the cells aren't flat.

Most half decent lipo chargers can do A123s (Li-fe or Li-ion setting, whichever says 3.7v for the fully charged voltage and 3.3v for the resting voltage), but it does need to be a 6s charger and have a good power output to make the most of that ~5c charge rate potential. 12 of those cells weighs about the same as 7 or 8 nimh cells, which isnt too bad, but still twice as heavy as a similar spec'd lipo, so... personal choice.

Buy LIPOS!!!

Resurrecting a bit of an old thread, but the seller updated the sale a little bit. Hes including pictures of disassembling a dewalt DC9360 pack now and says they come straight outa them. Price dropped $5 as well.

Did anyone get these? How were they?

Thanks!

.dk

Yeah I bought a set. I could tell from his original pics that they were battery take-outs (you could see where tabs were welded on before). I finished tinning all 12 cells yesterday. I have yet to charge/run them.

LIPO!!!!!!!!

Ask zeropoint the difference....

What are you running them in?

I'm thinking the Rustler. I'll be making 2 6s1p packs from them. Does anyone have a link to some oxygen-free fine copper mesh? I want to use that to solder the cells. Battery bars hold too much heat so I'm afraid I wont get a good connection.

I don't have a 50ton press, but I have a pretty big bench vise and a big sledge hammer... I think we should try it!!!!

You're basically looking for copper braid, right?

http://www.hobby-lobby.com/copper_br..._2847_prd1.htm

I've used LOTS of this stuff, but I use it 2 rows at a time (two pieces for each end of a cell). Has worked great!

Thanks MM. I found this too- http://www.action-electronics.com/braid.htm. They have some wider braid (1/4" diameter shoud be about 3/8" wide (flat) right?) and it's oxygen free so it wont corrode inside the pack.

Just worried that they might be rejects, like packs that didn't past factory tests or something.

We want to upgrade the cells in our 30 lbs combat robot to A123 cells at some point. Perhaps even our 120 lbs if we can fit it into our budget. We've destroyed batteries in the arena before and the charge rate will be awesome to top them off inbetween matches.

Looks like solder wick :oh:

.dk

Thats exactly what solder wick is- takes solder well and can handle lots of current/heat. :yes:

The seller says they're brand new. It's probably old stock, but we all know they last forever on the shelf.

haha they spelt united states "united status"

At least they used a spell check :lol:

.dk

SUICIDENEIL!!!!!!

Damn man, you shoulda told me about this deal! I wouldn't have bought the Hyperion VX packs then for my lawn mower! I never check the general discussion board, I just happen to be browsing around and came across this post.... dang dang dang. This would have owned the lipo's in the mower, cheaper, longer running time, cycle life, and they would be tough to boot in a mower. I am so excited about these man! Seriously, $9000 for my Toyota truck and I would have the same range, if not better than my 30 Yellow Top lead acids, plus they would have much better performance, and dirt cheap in the long run! 75 cents per Watt-hour...... frigging awesome! I can make my electric super bike for cheap now! I want to use a 70hp electric series wound DC motor for it, if not, then a 40hp brushless DC motor system. gigity :party:


Nitrostarter, yah ask me the difference... lol. World of difference for the G3 packs, flat discharge curve similar to A123's I have found. But Nitrostarter, in EVERY other application, A123's are better suited

Better late than never I suppose? :whistle:

AArrrgg...

And guess what, I am seriously thinking of buying 4 sets of these! Along with another 8s A123 pack I have, I can make a 8s7p pack, or a 8s8p pack if I use my 7s1p Revo pack along with one cell of a couple I have sitting around. That would get me 45+ minutes of runtime, of glorious grass cutting runtime. That's almost enough to do my entire yard.

I should have been on the GD board since the start... I have confined myself to the brushless board up until now.

But, thanks... I guess, for posting this link up. It's made me seriously happy! :yes:

Have you tested your cells yet? I would like to get 4 sets of these for my lawnmower. Let me know how they perform.

BTW, in the eBay pic, the front M1 cell is actually an OLD M1 cell (notice the thinner darker blue line), like not from a Dewalt pack, but from the developer kits, I would know because I bought a developer kit the first week they were available (3 years ago)... actually still have those cells too in 5s1p packs, still perform as good as new too, go figure. :yes:

No, I haven't. :oops: I need to buy a charger set up for A123 cells. I have a DTX Ice and an AF 109 Lithium. Neither one can charger A123 properly. I'll get to it soon, I just have to pay the bills first. :yes:

The AF109 can be modded relatively easily to charge up to 10s A123 and still maintain Lipo charging capabilities. Lemme see if I can pull up the info for that.

EDIT: Look here:
http://www.rcgroups.com/forums/showthread.php?t=602445

Only a few $$ for parts, and you have a multi-function charger capable of about 170watts!

^ Thanks MM. I saw that a while back, I guess I forgot all about it.

I finished the mod. I know it will work, though I can't test it. The proof is in the math:

3.6/4.2=0.857

Then I attached a 4s LiPo with a resting voltage of 16.36v, hit the switch, and voila:

16.36/18.91=0.865

This corresponds to:

0.865*4.2=3.633

So the A123 will charge to 3.633v/c.

Pics here if you want...