Li-Ion Power Tool cells work great for RC!

[Serum]

yeah 110A bursts are okay for the 9920.

[coolhandcountry]

I only found the evo 20 packs. didn't see no 50c packs.

[Nick]

Serum said they are called the "New Formulation" or something. ;)

[nl12]

These new lipos look great, I wish I could trade mine in for these

[Serum]

just look a bit closer country.. They are there for sure.

[MetalMan]

Did anyone happen to notice the temperature graph of the cells? 75 deg. C is a lot! (160 deg. F) Lipos usually shouldn't go over 140 deg. F or 60 deg. C.

In case anyone didn't notice, they posted the same graphs for the regular 20C packs as the "New Formulation" 20C-50C packs. So how do we know that the cells are any different?

Originally Posted by Nick

I love the charge rates with these packs too! Tested at 2.5c.

While it certainly is conveniant, it also decreases the number of cycles that a pack will hold up for. Most Lipos these days are capable of 2C charges, as long as there is a balancer (the differences in the cells' internal resistances is amplified two times with a 2C charge).

Originally Posted by BrianG

I'm all up in the air about this stuff.

One minute I want to wait for the A123Systems M1 cells from the DeWalt 36v line, but then I find they are only 2.2Ah, are kinda big (26mmD x 65mmL @ 70g), and aren't exactly like typical Li cells; they only charge to 3.6v (not 4.2v like others), which will make charging a little challenging. By the time I set up a 4s2p or 5s2p pack, I'll be at the same weight and size as equivalent NiMHs (or close to it).

Next, I think I'll try those Emoli cells from the v28 packs, but then I don't want to go with a 2p arrangement for weight and space (each cell is 26.5mmD x 70mmL @ 99g) since they don't have the burst capability.

That leaves LiMn, NiMH, or Lipos. LiMn are a bit pricey for what I need, but seem like the best choice so far despite some peoples mixed feelings. NiMH are just too heavy and bulky for what I want to use. Lipos, well, I won't go into that again.

:032: :032:

If you are that concerned about weight, then round Lithium-based cells are not for you. They weigh more than prismatic cells mainly because of the (usually) steel casing. You just can't get much lighter weight than a plastic pouch!
If you go Emoli and use 1p, you're going to need a high voltage for the pack to hold up well.

[Nick]

Lipos last alot longer than Nimhs though right? If used correctly.

Do lipos "fade out" like some nimhs, for example towards the end of a run there is less power?

[coolhandcountry]

From my experence nick. The packs run about the same from beginning to end. I don't see much difference if any. If it was not for a lvc i can see where you would mess up some cells.

[Nick]

On the Flightpower Lipos, what is the little connector (looks like a reciever plug) for?

[nl12]

Balancer

[MetalMan]

^ is correct. At the end of a charge (or from about 3.8v and up) it keeps the individual cells at the same voltage.

[cart213]

I finally found someone with an extra cell that they sold me. It'll ship tomorrow. Soon I'll be able to try out a 4S2P emoli configuration.

[cart213]

I tried out the 4S1P in my MT2 this morning, and it did better than I anticipated, considering the potential amp draw of the 9L. I did several speed runs up and down the street and recorded a max gps-verified speed of 48 mph. This is just barely less than the 50 mph I achieved with 12 IB3800's. I only ran the emolis for about 5 minutes, but the cells didn't heat up at all. When I get that extra cell, I'll be able to see how 4S2P performs.

[coolhandcountry]

Let us know how they work out. Do you expect abovethe 50 mph with the 4s 2p?

[Serum]

I am sure you will get above the 50mph with two of them P