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May 31, 2006, 12:14 PM
Electric Helis is my game
MrMel's Avatar
Discussion

DeWalt 36V


Anyone got hold of those yet?

http://www.tylertool.com/dewalt97.html

159$ sale price..
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May 31, 2006, 12:17 PM
Registered User
mexico's Avatar
what would you do with it - power a field charger? It does not mention capacity.
May 31, 2006, 12:18 PM
Flying motor mount master
fly_boy99's Avatar
Take it apart to get at those A123 cells!!!
Last edited by fly_boy99; May 31, 2006 at 04:59 PM.
May 31, 2006, 12:47 PM
Electric Helis is my game
MrMel's Avatar
Exactly, take it apart and see if its the same setup as V28 or maybe even better?
May 31, 2006, 12:49 PM
Member
Goekeli's Avatar
Are these not the a123 cells?

goe
May 31, 2006, 02:19 PM
RC Ace wannabe
Ace in the hole's Avatar
Yes I do belive a123 makes these cells not emoli, but basically the same technology.




Found this press release-- http://www.a123systems.com/html/news...051102_pr.html
May 31, 2006, 03:57 PM
Carbon based lifeform
brian.pedersen's Avatar
They say its Li-ion based, and states:
  • High Power. A123Systemsí first product packs up to five times the power density of current rechargeable, high power batteries. In addition, the battery has the ability to recharge to 90% of its capacity in five minutes.
  • Intrinsic Safety. Unlike conventional Lithium-ion batteries, A123Systems' batteries employ new thermally stable, non-combustible active materials, enabling a safer cell and allowing cost reductions such as the elimination of unnecessary battery pack components. In addition, A123Systems uses an environmentally friendly chemistry.
  • Long Life. With up to 10X improvement in life over existing rechargeable batteries, A123Systemsí batteries can deliver thousands of cycles at high rates. Cycles refer to the number of times a battery can be charged and discharged before it no longer has any power remaining.

5 minutes for 90% capacity recharge, is that the statement of a drunk salesman

/Brian
May 31, 2006, 05:25 PM
Registered User
That's the capability of these cells! I think the capacity is somewhere around 2Ah. In that case, a 5min. charge is 12C, and 12C x 2Ah = 24amps! Not to many people have chargers that can do 24amps... (except the CC/CV clamping power supplies).
May 31, 2006, 05:58 PM
Registered User
Is it worth it??? Could that battery alone power a towplane? I remember a short few years ago you'd load up on 2000mah sub-c's in the 30-40v range and run a cobalt 60 or 90... could this be an economic alternative?
May 31, 2006, 06:22 PM
A man with too many toys
If you take 36v / 3.7v per cell that equals 9.7 cells per pack. Thatís really strange Ė do you get 9 or 10 cells in a 36v pack?

.
May 31, 2006, 06:28 PM
Renewed interest
ozace's Avatar
I recall they say the cells are 3.6v so its 10 cells.

I just had a look for some but the ebyer doesnt have stock, its for late june delivery
May 31, 2006, 07:26 PM
Wind is the devil.
Argyle's Avatar
You could fly a MAMMOTH plane with 10 of those cells. Amazing price, hope they work.
Jun 01, 2006, 05:50 AM
Registered User
mmormota's Avatar
Quote:
Originally Posted by Argyle
You could fly a MAMMOTH plane with 10 of those cells. Amazing price, hope they work.
The Milwaukee packs have better price/energy factor.

Let's see how these cells work under really heavy load. If they are better, its a good alternative to Lipos in big Jets and helis.

As the A123 is a lower capacity, lighter cell, it may fit better to smaller planes. Ie. a T-Rex is just too heavy with 3 eMoli cells (300g) but may fly better with a 3s A123 (210g). (an average Lipo for the T-rex is 160g)
Jun 18, 2006, 10:39 AM
Gigaah
I've Gotten some of these A123 systems cells in. I'm working on testing them. here are some pictures and what I've found.

Well I've charged and discharged them 3 times.

Charge 2.2A Discharge 2.2A 2400MAh ...cell not above room temp after charge
Charge 5A Discharge 10A 2200MAh ...Cells slightly warm
Charge 8A Discharge 10A 2250MAh ...Cells definatly got warm (no temp sensor as you can tell)


I'm not sure how warm to the touch 90-95F is that the ICE manual called the max temp range but I suspect I might have reached that, perhaps exceeded it at 8A charge...can't really say as I don't exactly know how warm 95F is by touch. I'll have to order a temp sensor. I do notice the discharge voltage according to the ICE never really sits at 3.6V under load Its always 3.4 and well under most of the time. I'm a bit concerned about that and the temp at 8A but I don't charge many lipo but I think it should hold voltage better than that right? Maybe someone has an explanation? I also noticed the voltage spiked to 4.4 after the constant current cut off on the last charge...its the only cut off I saw..any insight is welcome.

Gigaah
Last edited by Gigaah; Jun 18, 2006 at 10:46 AM.
Jun 18, 2006, 11:54 AM
Registered User
Quote:
Originally Posted by Gigaah
Well I've charged and discharged them 3 times.
.......
I'm not sure how warm to the touch 90-95F is that the ICE manual .......
Did You charge them using Lipo program of Duratrax ICE?
I found elsewhere that this cells (A123 M1) have to be charged to 3.6V final voltage, Li-Fe program on some newest chargers.
There was clearly mentioned that 3.7V is probably held on, but 3.8V will destroy LiFe A123 M1 cell - puffed pressure fuse, leaving laughable rest capacity..
https://www.rcgroups.com/forums/show...3&postcount=68

Voltage under load is 3.2-3.3V as mentioned in acrobat document (.pdf) on http://www.buya123systems.com/prdeki.html


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