How big is the 5Ah cell? I like how the tabs are on opposite ends - makes wiring less risky for those with shaky soldering iron hands. And speaking of the tabs, are they Al, steel, etc? And how thick are the tabs? I hate how a certain company's tabs are like 0.05mm thick and tear by looking at them.

Oh No, you must be thinking about "reject" cells or something.

:rofl:

I will sign on the dotted line.I will take 8 of those 2700 30c cells.LMK.I would like to see the 5000mah cell as well.

It's 10mm X 50mm X 150mm. The tabs on any of the flat cells can be made that way. I have no clue what they're made out of and how thick the tabs are.

Sounds good,I will take 8 of the 5000's then,what's your paypal LOL.

I'm not selling it. I would hate to run MA out of business :lol:. Lets wait until they offer them :rofl:.

O.k,I see.I was going to buy some ma packs anyways until I saw those,I have been working 14 part time jobs as well as my full time job and I almost have enough to get one of the 4 packs I need.Too bad your not selling.LOL.

Just get the ones Hobbycity sells.

I already have 4 on order from HC,I was kidding about the ma packs and the 14 jobs.Can you tell me where you are getting these from so I can order some or is that your little secret?

I know you were kidding :lol:. So was I, there's a MOQ since I go directly to the factories. I've done my research to find most of the factories and I would hate to just give all my info away for free :wink:. I'm really thinking about bringing a few of the cells just to shut MA up a bit. I am getting 2 cylindrical cells that are supposed to pack a punch and teach A123 a lesson of what people are looking for (If they work :lol:).

I was into this type of "research" for a long time.

Some Companies are good, some are not so good to deal with.

One thing that always kinda got me was, there isn't very many of them that speak (or type) English very well.

Testing samples is always a good idea before placing a large order. Even if they have a so called MOQ (Minimum Order Quantity), they are almost always willing to submit samples to make the sale.

Quality is always a question. It's very lacking with some companies and better with others.

Testing is fairly easy to do in the short term, but it's hard to test longevity.

The Lifepo4 Chemistry in itself, is impressive.

I like the 5ah cells. 10mm thick though? I wonder if a 3S pack would fit the E Revo? That would be pushing it.

I'd like to see some small packs to fit the Mini Slash etc. With a youngun there is a "no soft case lipo" rule in our house, so I'm stuck on Nimh right now.

I'll be testing a 2/3A cell when they come in. They'll be replacing my NiMH and lipos currently being used in my minis. One of the LiFePo4 battery makers that I know said they licensed a new material to make a higher C rate cell. I hope it works good.

The research I do is mostly for my clients. It's funny, because a lot of them are in Asia, but they want me to source the parts they need. That's how I find most of the companies I know of. If English is a barrier, I just type something to my client and they translate it for me :lol:. I like to test before I order and if things are not right, I just let it go fast. Quality is mainly up to the end customer, but if there's a new material in the works, most of the time it will fail a few times before that matures. I think a 3S can fit the E-Revo, it'll be a little over 30mm thick after the pack is assembled, but the length could be way over 150mm. Keep in mind other capacities can be made, those were just old pictures one of the manufacturers sent me.

Do you think the MA boys are watching now? They're not very active lately.

Of course they are still watching. They just know their role and have chosen to shut their pie-hole. LOL

The 4500mah Turnigy packs that I've been running are very nice. I like them alot.

One thing I've noticed about them, they seem to be improving on capacity the more I cycle them. It almost seems as if there is a break in period.

lol. I want to send them packing fast, but there might be a large MA cult and I fear for my life :angel:.

I was watching Sponge Bob with my daughter the other day and it was opposite day. So when MA said the Turnigy LiFe packs were reject, were they playing opposite day? :rofl:

There's usually a coating on the tabs and they need a few cycle to melt that coating away. Not sure if they use it like they do with the lipos, but it might be a possibility. Have you done any 1C discharge to see the capacity of the pack?

I was just going by mah returned, but it's not accurate since I usually charge at 5 amps or above.

I can do a 1C discharge test and report back. Maybe even do that every so often and log the results. Get some trending results in the works.

Little late tonight, perhaps I'll do that tomorrow night.

How many times have you discharged and charged the pack? At 5C, what is the capacity being put into the pack?

The 1C discharge will basically tell you the real capacity the cell is at, it might be the same as the 5C, but it should be more accurate. Take your time, I'm not in a big rush :lol:.

Unfortunately that one would be a bit too big for my trays in a 5S config.

The custom trays I have are ~35mm wide, ~160mm long and unlimited tall (50-60mm max tho really)

I've been looking at some of the Turnigies, but they don't have any in the right sizes (it's still quite limited.) The 2250 cell you pictured would be perfect. Hell, if anything it could be longer.
Would also fit in my crt.5 nicely tho.

Any ideas on the MOQ or a very rough ballpark on price? I'm guessing the MOQ is rather large, maybe 30-50 pieces? Doubt its 10...

The 2700mAh would fit if you put 4 cells on their side and one on top :lol:. I sent an e-mail asking for prices, so lets wait and see. If they're too high, I'll beat them down a bit like I did with the 2 cylindrical cells :lol:. The MOQ is a bit high (I'm guessing, but it's usually 200pcs. for each capacity), but I might be able to work something out. I'll ask them if they can make a 10mm X 34mm X 150mm and see what capacity they'll come in at. Let me get some sort of pricing first for the soft flat cells and I'll ask about the custom cell later, I know they can do it.

Thanks Lutach :party:

What did I do? :angel:

But, you're welcomed :lol:.

It would, but then the voltage is too low for what I am wanting ;)
From my A123s, 4S lipo~=5S A123. 6S Life would be even better :)

The custom size would be absolutely awesome, but IDK how many would need a weirdo size like that, and I couldn't put 200 pieces to use no matter how hard I tried. :) If its a possibility, then awesome. I would think the cap should come out to ~3400mah then right? I use 8S 4000s now and its quite nice.

Ok, understood. I still haven't got the prices for the cells, so I'll have to make a phone call later tonight.

Hey man, NP. Its not a rush. Thanks for all your help. I always appreciate your info and insight.

Ok, but I need to talk to them anyways regarding my 2 other LiFePo4 cells.

I'm flattered :oops:, but I'm as dumb as they come :lol:. I do appreciate your and many others' info and insight. I'm still learning and with more and more new things coming out, I'll probably be learning something new all the time.

Stop being modest Lutach. You know you da man.

I'm not, I wish I could do all the things I have in my head, but I'm not that smart.

You are smart enough to come up with new ideas. It's called being inventive.

I try. The best ones are stuck in my head. I might copy one that I had since Brasil and in the 90's I put it on paper. I'll make a new thread about it and I'll probably add some of my crazy car drawings that I still have. I'll try to get the others from my best friend, but he said he's not letting them go that easy and keeps telling me he forgot where he put them :lol:.

How are you liking the info on this LiFePo4 packs from Hobbycity? Have you seen info like it about the MA Green packs?

Hobbycity list theirs at 40C burst and MA at 60C. Sup with that? 1000 cycles. I haven't been nice enough to my A123's to reach 1000 cycles. I don't think I reached 600 cycles on one pack before it vented. I really want to know it the MA "higher" quality cells have the same voltage drop like the A123's.

The Turnigy Lifepo4 packs I have, appear to be tough as nails.

I have ran a simliar 4S2P A123 setup in a Monster Truck before.

I believe the A123's voltage drop under a load is greater than these. There's just alot more punch.

coolbeans. Good to hear the improvement. Now how hot can they get before they loose capacity.

I have around 10 cycles on the packs so far.

At 5C charge rate, I have no idea.

I did do a 1C discharge test (at 4.5 amps), it shows right at 4200mah.

Thats and understatment! That 2s1p pack you got up to like 195f I think. I remember that thing was so hot, I was impressed by the fact it worked after it cooled down. It lasted almost a year didn't it?

It seems that battery technology is moving pretty fast the last decade, at least faster than it has in a while, I hope it continues.

Jeff

Yea it did last a year after it got that hot. I have another 3s1p pack that reached that kinda temp and its still in use. I only get about 1800mah out if now. My 6s1p pack has seen 170+F quite a few times and still does 2300mah. When it was new it took 2500mah.

That's not so bad.

Anyone seen the new MA 1/16th packs, sad to say I am tempted.......

Anyone seen the similarly sized Turnigy packs for less money than a couple movie tickets? :tongue:

If Turnigy had Lifepo4 packs to fit the 1/16th Slash / Revo I'd be all over it!