new lithium cells

Murdoch · Post by **Murdoch** » Sun Apr 22, 2007 5:38 pm

Last night, I started doing some research on a new type of lithium ion battery on the market. They're called Emoli cells. Unfortunately the places that had bare cells and premade packs was quite expensive for the cell count I wanted.

That was a problem for me.

So I looked on ebay for these cells, and I found this: Link

A Milwaukee V28 battery pack that contains Lithium-ion maganese cells. 7 cells in total for about 115 bucks. that works out to approx. 16 bucks per cell.

This pack will show up here in.. a month I think.

Once I pull apart the casing, I'm sticking a 2s2p configuration into my TA05 drift car. If these rock the house, I'm gonna give the nimh and nicd packs I have the boot.

From what I've read, these cells give a very good runtime and they don't fizzle out over time. So start to end, I'll have the punch I need.

Murdoch · Post by **Murdoch** » Sun May 20, 2007 8:07 pm

aw shit i forgot about this thread.

I got the cells in, and chewed through a few cycles.

these things are fuckin insane. It's like goin from pumpgas to nitromethane.

I stuck a 22 tooth on my 19turn motor, and slapped on some yokomo drift rubbers just to see how these things stood up.

the thing's faster than my M18. And my M18 is a fuckin rocket.

Threw on the ABS for drifting, and now I have to take a break before the car runs out of juice. I'm lookin at 25 minutes plus for runtime.

The hobby shop owner wanted to take er for a spin and he was blown away. he kept askin me 'what do you have in there??'. So I told him.

So grab em while you can, because these things rock the house for ten scale cars.

ph2t · Post by **ph2t** » Mon May 21, 2007 12:16 am

got pics?

Clint · Post by **Clint** » Mon May 21, 2007 12:58 am

i think you can buy a 6 cell sample pack direct from the manufacturer for 100$. there was lotsa talk about them recently on rcgroups.

here's the specs on those cells. (murdoch, are these the same as yours?)

http://www.a123systems.com/newsite/pdf/ ... 2007-1.pdf

Murdoch · Post by **Murdoch** » Mon May 21, 2007 2:46 am

Nah, the ones i'm using are Emoli cells.

same voltage as lipos, which means I was able to stick em on my ICE charger.

I'll get some pics up in a while... but being close to 1 am here, it's insanely close to shut eye time for me.

Nasphere · Post by **Nasphere** » Mon May 21, 2007 9:27 pm

I read something a while ago about a new lithium cell called lithium phosphate. They have the usual max voltage of 4.2V, but a minimum of 2V. They have about the same specs as NiMh batteries but at 20% less weight.

Here's some specs on random shit I've pulled off the net.

Li-Ion = 140 Wh/kg

Li-Pho = 130Wh/kg

NiMh = 100 Wh/kg

Lead-acid = 35Wh/kg

Clint · Post by **Clint** » Tue May 22, 2007 7:51 am

Cool Nas
I've been running lithium ion phosphate in my heli. why?.. crash resistance.

if they short, they just die, no thermal runaway and they wont
ever explode, even on an overcharge.

mine are so dinged up now, that if it were a lipo, i'd have gone thru a
few nuclear meltdowns.

Nasphere · Post by **Nasphere** » Tue May 22, 2007 5:19 pm

Clint wrote:Cool Nas
I've been running lithium ion phosphate in my heli. why?.. crash resistance.

if they short, they just die, no thermal runaway and they wont
ever explode, even on an overcharge.

mine are so dinged up now, that if it were a lipo, i'd have gone thru a
few nuclear meltdowns.

Haha, yeah, I believe you were the one to turn me onto researching these things a while ago. I think the reason they won't explode is because they have no sensitive chemicals, everything is dry.

I also read something about a Lithium Sulpher battery.. The watt hours / kg are around 350 and they have some that do around 600, but only as lab examples. I think the max discharge is around 2C though... Still cool as hell for digicams and other consumer electronics.

Murdoch · Post by **Murdoch** » Wed May 23, 2007 8:08 pm

Pics, as promised. Outdoors works so much better for this cam.