Turnigy LiFEPO4 packs - RC-Monster Forums

jpoprock · 11.24.2009, 03:37 PM

Quote:

Originally Posted by lincpimp

Not sure if the evx2 can handle 5s LiFe cells in series, that would be 18v fully charged...

Sorry. I was speaking of a 2s on one side, and a 3s on the other. Both 4500mah's to equal 5s.

So now what say you about that?

lincpimp · 11.24.2009, 03:59 PM

Quote:

Originally Posted by jpoprock

Sorry. I was speaking of a 2s on one side, and a 3s on the other. Both 4500mah's to equal 5s.

So now what say you about that?

I understand that you planned to run a 2s on the bec side, and a 3s on the non bec side. I was just not sure if the evx2 can handle that...

If it can handle it you should be good to go.

sikeston34m · 11:35 PM

Just a little update here.

After running 5 or so cycles through the MM Pro in the e maxx running a HV4400 with sinter rotor/5mm shaft, it was time to move them to my E Revo.

My E Revo is setup with:

MMM ESC
Medusa 36-60-1500 geared 22/40 using Mod 1 gears.

This is more of an amp hog than the E maxx setup.

The packs handle the E Revo just fine. They have alot of punch.

I've ran them in the E Revo 4 times now. Two of those times were both in the same hour today.

20 amp charge rate.

They come out of the E Revo about 100 degrees. Still not bad, but this does show they are being pushed harder.

himalaya · 11.29.2009, 05:49 AM

Quote:

Originally Posted by jpoprock

Sorry. I was speaking of a 2s on one side, and a 3s on the other. Both 4500mah's to equal 5s.

So now what say you about that?

A123s have huge voltage drop under load, 2.5V/cell is pretty typical. The BEC has no way to provide 6V output with only 5V input.

Maciolus · 12.01.2009, 04:08 PM

Do you know exact size of single cell (4500mAh pack is 2P)? I am wondering if it is possible to make saddle pack for 1:10 buggy.

lutach · 12.01.2009, 05:38 PM

Quote:

Originally Posted by Maciolus

Do you know exact size of single cell (4500mAh pack is 2P)? I am wondering if it is possible to make saddle pack for 1:10 buggy.

I have attached a picture of what the cell looks like, but you can have it with the leads like the other picture of the 5000mAh. The size of the 2250 cell is: 9mm X 34mm X 104. I have other pictures of the other cells available if you or anyone else would like to see.

lutach · 12.01.2009, 05:44 PM

This would be best to make a saddle pack, but you have to stack a few of them to get the capacity up enough. The factory can do other sizes, but need a large enough order though. The size of that one is: 10mm X 45mm x 43mm.

Finnster · 12.01.2009, 05:52 PM

Quote:

Originally Posted by lutach

I have attached a picture of what the cell looks like, but you can have it with the leads like the other picture of the 5000mAh. The size of the 2250 cell is: 9mm X 34mm X 104. I have other pictures of the other cells available if you or anyone else would like to see.

These are cells you have access to? How much are they? 2x 5s1p or 6s1p 2250 would be perfect for my HV Savvy. What is the burst? I see A spikes usually in the 65A range, and upto 90A. That's only 40C max.

LMK

lutach · 12.01.2009, 06:01 PM

Quote:

Originally Posted by Finnster

These are cells you have access to? How much are they? 2x 5s1p or 6s1p 2250 would be perfect for my HV Savvy. What is the burst? I see A spikes usually in the 65A range, and upto 90A. That's only 40C max.

LMK

I have access to basically all the manufacturers of cells in Asia. I haven't asked for price for any of them since I really don't have any interest of having liabilities nightmares incase something goes wrong

. I'm in the process of having 2 LiFePo4 cylindrical cells made and it should take around 30 days. One is a 2/3A size for minis and it should have a capacity of 300-500mAh and a Sub-C size one with a capacity of 1200-1400mAh. I can get pricing and MOQ if you want. Also, they'll be fresh cells so it should take around 30 days to get them made.

lutach · 06:08 PM

Quote:

Originally Posted by Finnster

These are cells you have access to? How much are they? 2x 5s1p or 6s1p 2250 would be perfect for my HV Savvy. What is the burst? I see A spikes usually in the 65A range, and upto 90A. That's only 40C max.

LMK

I think you would love the following then. See pics

. Should I get them all here and mess with MA a little? I really don't care about making a profit on them and I would just have people sign

some paperwork that would clear my name from any wrong doing if they get hurt in any way, shape or form. What do you think?

Edit: The size for the 2700mAh is: 7.5mm X 43mm X 125mm.

Finnster · 12.02.2009, 12:54 AM

Quote:

Originally Posted by lutach

I think you would love the following then. See pics

. Should I get them all here and mess with MA a little? I really don't care about making a profit on them and I would just have people sign

some paperwork that would clear my name from any wrong doing if they get hurt in any way, shape or form. What do you think?

Edit: The size for the 2700mAh is: 7.5mm X 43mm X 125mm.

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...

BrianG · 12.01.2009, 07:29 PM

Quote:

Originally Posted by lutach

I have attached a picture of what the cell looks like, but you can have it with the leads like the other picture of the 5000mAh. The size of the 2250 cell is: 9mm X 34mm X 104. I have other pictures of the other cells available if you or anyone else would like to see.

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.

sikeston34m · 12.01.2009, 07:32 PM

Quote:

Originally Posted by BrianG

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.

lutach · 12.01.2009, 07:51 PM

Quote:

Originally Posted by BrianG

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.

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.