Li-Ion Power Tool cells work great for RC! - Page 8 - RC-Monster Forums

MetalMan · 05.20.2006, 04:21 PM

They are round cells.

The specs don't look too bad. 2p would be an obvious requirement, unless you're doing some short speed runs where weight savings are wanted. These cells seem have close to the same nominal voltage as the Saphion (LiFePO4) batteries I have (3.2v). Those have a CV phase charge voltage of 3.65v, but can accept 4.20v without problems.

Hopefully the prices will go down like they have with the V28 packs, so then some of us can try them :).

cart213 · 05.22.2006, 01:27 PM

Emoli has put an end to M2EnergySolutions plan to sell individual cells. In order to make a 2p pack, I guess I'm gonna have to find somebody with an extra cell they don't need.

MetalMan · 05.22.2006, 06:32 PM

Over there, I'm TMetalMan. Check out my posts and the responses.

05.22.2006, 07:13 PM

Cart;
I have some of the 1500 mah ones left over (4) of them. Could make a 7.4v 3000 mah pack.
If anyone needs some let me know.

If I had to buy a big pack again I would but li po's they are just easier to deal with. Flat, lighter and smaller.

cart213 · 08:11 AM

Quote:

Originally Posted by MetalMan

Over there, I'm TMetalMan. Check out my posts and the responses.

Yeah, I had already figured that out. You really need to standardize your screen names: TMetalMan, MetalMan, tcoleson... lol! :005:

cart213 · 08:18 AM

Quote:

Originally Posted by fishmasterdan

Cart;
I have some of the 1500 mah ones left over (4) of them. Could make a 7.4v 3000 mah pack.
If anyone needs some let me know.

If I had to buy a big pack again I would but li po's they are just easier to deal with. Flat, lighter and smaller.

No thanks. I need to get another 3000mah cell. I would have gotten lipos, but I couldn't find any that were the shape I need. I want something that is the same size as a 6 cell NiMH brick pack, and 4 Emoli cells are almost perfect. Commonsense RC has a lipo that was close, but I decided to go out on a limb and try the li-ions.

Look at my avatar, and you can see how I'm restricted in my battery selection.

BrianG · 05.23.2006, 12:25 PM

I am still looking for "the perfect cells" to use for my race Revo. I was waiting for DeWalts M1 cell packs to come out, but I don't think they will work as they will most likely be only 2.2Ah. No telling for sure until someone gets a pack and pulls the cells out. I'm still hoping they will be ~3Ah each because I want at least 25 minutes of runtime, and they have a higher discharge and charge rating.

Because I'm impatient, I'm now looking at the emoli cells from the V28 packs (3Ah per cell). However, those are unofficially rated for only 15C (45A) or 20C bursts (60A) from the temperature vs amperage graphs someone over at rcgroups compiled. I would get these, but would a 10XL motor pull more current than this with a 9-10lb truck? The motor is rated for around 66A. I know the motor won't pull that current all the time, but I don't want to hurt the cells. Also should I go with 5s or 6s?

squeeforever · 05.23.2006, 12:52 PM

Brian, I run a 10XL on my E-Revo (setup to race) and I think or racing, 4S would be PERFECT. 15C should be plenty for this motor as well although i would personally go for a 2P setup. With the M1 cells a 2P setup will get you over 30 minutes of runtime I believe. It just depends on driving style. I've still only got 4 runs on my new IB4200s and they kept getting 5 minutes more every time. My last run was about 23 minutes of really hard running.

BrianG · 05.23.2006, 02:31 PM

Only 4s? I got the 10xl so I could go with a higher voltage. Plus, I figured I would be a little easier on the throttle with ~20v as opposed to ~15v. Since the M1 cells are only 2.2Ah, it makes sense to go with a 2p setup, but then the cells weight as much (and take as much room if not more) as equivalent voltage/capacity NiMH cells. This is why I was looking at the emoli cells, which are 3Ah, and then use 5s or 6s for higher voltage.

On my relatively heavy bashing Revo (~13lbs), I get about 20-25 minutes of runtime on 14 GP3300 cells with an 8xl motor. I figured that motor draws substantially more current, so a similar battery setup (capacity/voltage wise) would last quite a bit longer on a 10xl. However, I've never raced, but I have heard racing is harder on batteries.

squeeforever · 05.23.2006, 02:49 PM

Yes, chances are it will be harder on your batteries but with a fast brushless setup chances are you will be pretty easy on it since you will have all that power. I get 40ish mph with my 10xl and high gearing (20/51) on 14 cells and its a BEAST. Its PLENTY for a track and I figured that its gonna be lighter and have slightly more voltage probably. Maybe 5S if you want more than enough power plus it will run more efficiently. Either way, you'll be surprised as to how fast a 10XL on 14 cells or 4S lipo is. One main advantage to 4S though is less weight.

MetalMan · 05.23.2006, 05:18 PM

I think that to use Emoli cells, a 2P configuration would be best. 6s Emoli can only do 864watts continuously, and the burst isn't much higher, and that might not be enough. A 5s2p setup would weigh as much as 15NiMh cells, but have the voltage of 16 and the power of closer to 18 or more. Then the runtime would also be incredible...
4s2p would also suffice, and would be less weight.
If you like the M1 cells, why not use 2p? That would provide good runtime, and loads of power that you wouldn't know what to do with!

Nick · 05.23.2006, 05:49 PM

What are the dimensions of these, they look huge! Do you keep them in the plastic casing?

How quickly does 6kmah (5s2p) charge at with the Multiplex LN-5014?

I'm tempted, dare I say it. Also, is what I pictured above still what people are on about, lol... stopped reading at page 5.

MetalMan · 05.23.2006, 08:47 PM

Those packs don't use the same cells as the Emoli packs. fishmasterdan uses the cells from the Makita packs, so ask him about them. The mentioned cells now are the Emoli cells, available in the Milwaukee V28 packs. They come in a 7s1p format, and for most purposes the casing and everything besides the individual cells is not used.

squeeforever · 05.23.2006, 09:39 PM

One thing about the Makita cells is, unlike the Emoli cells, the Makita cells are 1500mah where as the Emoli cells are 3000mah.

BrianG · 05.23.2006, 10:04 PM

Quote:

Originally Posted by MetalMan

I think that to use Emoli cells, a 2P configuration would be best. 6s Emoli can only do 864watts continuously, and the burst isn't much higher, and that might not be enough. A 5s2p setup would weigh as much as 15NiMh cells, but have the voltage of 16 and the power of closer to 18 or more. Then the runtime would also be incredible...
4s2p would also suffice, and would be less weight.
If you like the M1 cells, why not use 2p? That would provide good runtime, and loads of power that you wouldn't know what to do with!

Hmmm. Well, I wanted less weight than NiMH, about half actually. Maybe I will wait until the A123 Systems M1 cells come out in the DeWalt unit. But those are only 2.2Ah according to that link I posted earlier. Again, I could go with 4s2p or 5s2p, but then weight goes up again. Looks like Li-Ion is not in my future after all. And I definitely don't want Lipos. Unless maybe something like this (one of each)?