Turnigy LiFEPO4 packs - Page 8 - RC-Monster Forums

suicideneil · 11.24.2009, 03:10 PM

I've seen the hvmaxx esc handle 5s2p, but that is slightly different to an evx2..

Parallel setup has nothing to do with voltage (normal cell count)- its just an easy method to double the runtime & reduce the voltage droop under load ( a stock brushed setup isnt gonna pull alot of current regardless).

Your esc is setup to use a pair of packs in series (2x 2s for example), so you will have to either rewire your esc to take a pair of 5s packs in parallel, or just do like Linc said and use a normal 2s Life pack on each input.

You seem to be over-thinking things- its nowhere near as complicated as you imagine- read my tutotials page, should help abit:

http://robotwars.00server.com/tutorials.html

Finnster · 11.24.2009, 03:21 PM

In all fairness, MA may be correct in saying they are "reject" cells. However, one should not assume that rejected material is bad material. Rejected material maybe 99% quality of accepted material, and no differences may be noticed in anything but specific bench tests.

Any manu process will have a failure/rejection rate. What is done with this scrap material is interesting. There is no reason why a manu can't classify grades of reject material and sell them as such wholesale. Its a common practice in many industries.

Outlet stores began as sellers as "reject" or surplus material. Lots of people still find good deals and qualty goods at outlet stores.
EG: I really like Le Creuset cookware, but its very expensive MSRP. I buy all my cookware as seconds at their outlet stores. For much of the products, you can not tell the diff from the firsts and seconds, and the few you can are usually due to minor cosmetic errors. However, they did fail QC as a first run material, and are not sold as such. I am very happy with all my seconds, and more happy with the 70% less I paid for it. I can promise you it makes no fraking difference in how the food comes out.

Finnster · 11.24.2009, 03:24 PM

Can the EVX2 handle 14cells NIMH? Even 5S Life is 18.25V, which is less than 13cells NIMH fully charged. Hard to believe they would make the specs that tight that it wouldn't work, then again, if you blow it up, don't blame me.

suicideneil · 11.24.2009, 03:44 PM

That should work fine- 2s on the BEC side, 3s on the other.

magman · 11.28.2009, 11:38 PM

Thanks for the update sike...I am thinking of getting some of these for my daughter's truck

shawzie · 07:52 PM

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.

shawzie · 12.01.2009, 07:54 PM

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

lutach · 12.01.2009, 08:01 PM

Quote:

Originally Posted by shawzie

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

. Lets wait until they offer them

.

shawzie · 12.01.2009, 08:04 PM

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.

lutach · 12.01.2009, 08:28 PM

Quote:

Originally Posted by shawzie

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.

shawzie · 12.01.2009, 08:36 PM

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?

lutach · 12.01.2009, 08:58 PM

Quote:

Originally Posted by shawzie

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

. 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

. 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

).

sikeston34m · 12.01.2009, 09:32 PM

Quote:

Originally Posted by lutach

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

.

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.

lutach · 12.01.2009, 11:30 PM

Quote:

Originally Posted by sikeston34m

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.

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

. 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.

sikeston34m · 12.01.2009, 11:50 PM

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.