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Old Jul 13, 2006, 07:51 PM
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Joined May 2006
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A123 is introducing li-ion battery packs for R/C

http://forums.radiocontrolzone.com/s...d.php?t=222362

Check it out! This looks to be very promising. Dave, are you going to be selling these???
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Old Jul 13, 2006, 08:18 PM
Über Geek
Kaneohe, Hawaii
Joined Feb 2006
770 Posts
Quote:
Originally Posted by cart213
http://forums.radiocontrolzone.com/s...d.php?t=222362

Check it out! This looks to be very promising. Dave, are you going to be selling these???
Wow. If all those claims are true, and I can somehow slam one of those into my Rex (I'd even buy a Rex 600 if those batteries aren't absurdly priced) I'll be buying dozens. 15 minute charge time?? Whoa. Can any of this stuff be verified? If cells like this exist, I have no idea why laptops are still using the crap batteries they use, with the hours of charging, etc. Electric cars could even become a realistic endeavour!
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Old Jul 13, 2006, 08:47 PM
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United States, TX, Argyle
Joined Jan 2005
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265 Grams for 2300 Mah

At least they are using the word "brick" in their marketing

Maybe a good aplication in the Ground and Water market

But I do not think that nearly double the weight of todays 20C's is a good trade to get to a 30C continious rating.

Maybe the chemistry is better.

Would be curious to see how they would compare in similar containers.
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Old Jul 13, 2006, 10:42 PM
"Fix it till it's Broken"
Irvine, CA
Joined Jun 2006
348 Posts
The reason others aren't using them is because companies look for cells they can mold into certain shapes round cells aren't very good for them. When A123 does flat cells and otherwise then they can. BTW lower charge rates help the poor little LT batteries.
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Old Jul 13, 2006, 10:55 PM
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Victoria, BC, Canada
Joined Apr 2001
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Quote:
Originally Posted by Microbatman
Maybe the chemistry is better.
They are lithium ion phosphate cells which are much safer. They can be overcharged without fire (unlike lithium ion cobalt LiPo) and aren't destroyed by discharging too low. They should also last many times longer than LiPo, but we don't have any real world tests yet.
For weight, they are better than NiMH.

Rick.
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Old Jul 13, 2006, 11:18 PM
HammerHead H2o Racing
Deltona, Florida
Joined Jun 2006
19 Posts
good for ground and water

we've been testing them in r/c boat applications for a couple months now and are very impressed with the Li-Ion M1 cells from a123...

we can run in [parallel packs] at less weight than equal voltage sub-c's in series...

we've been get'n an honest 4200 mAh of run time and in side by side tests done things with these cells that would have vented/cooked equal voltage sub-c's...

i'm not a flyer so can't comment to that end...

but as r/c boaters we see these cells as superior in a number of areas than the current crop of NiMh 1.2v sub-c cells we've been using..

Ron
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Old Jul 14, 2006, 02:19 PM
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Anybody have an idea of how effective the idea of using a transformer (Hypersonic Turbo) to step up the voltage will be? The weight penality seems to be 35 grams?

Just how effecient and able to react to variable power loads would that be?

Brad
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Old Jul 14, 2006, 07:00 PM
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Niagara Falls/Toronto area
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Quote:
Originally Posted by bjpaul
Anybody have an idea of how effective the idea of using a transformer (Hypersonic Turbo) to step up the voltage will be? The weight penality seems to be 35 grams?

Just how effecient and able to react to variable power loads would that be?

Brad
Brad: Effective? No way! There's no way that you can pump serious current through a DC/DC step up - not at 35 grams, anyways. If you want to bump up the voltage, add cells to the pack.

the *other* Brad
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Old Jul 14, 2006, 07:03 PM
"Fix it till it's Broken"
Irvine, CA
Joined Jun 2006
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Just buy more cells. It will require less current anyways.
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Old Jul 14, 2006, 07:39 PM
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Quote:
Originally Posted by 65535
Just buy more cells. It will require less current anyways.
That's what I thought...... wonder why a123 decided to offer that capability? Perhaps they are overly concerned with the 3.6v per cell compared to 4.2v per cell with Lipo.

Brad
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Old Jul 14, 2006, 08:16 PM
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Brad: Do you have a link to that "Hypersonic Turbo"?
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Old Jul 14, 2006, 09:46 PM
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It's in post #2 of the link in post #1 here. Say that 5 times fast...
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Old Jul 14, 2006, 10:55 PM
"Fix it till it's Broken"
Irvine, CA
Joined Jun 2006
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with 30.5C continuus discharge and 15 minute charge they would be great for flash bulbs in cameras. The problem I see is the useless nexx of such high discharge rates as I see it the more C you use the less runtime you have sure it raises the cieling but honestly don't buy higher C if you can get higher Capacity.
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Old Jul 14, 2006, 11:39 PM
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Dearborn, MI
Joined Apr 2006
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Cart213,

Good info. This is great! More choices for modelers!

I can't really say what have planned yet...it is not from A123... (Who knows... what I have planned might be a flop and burn a hole in the o'wallet ... One can not really tell at this stage...)

Dave

Quote:
Originally Posted by cart213
http://forums.radiocontrolzone.com/s...d.php?t=222362

Check it out! This looks to be very promising. Dave, are you going to be selling these???
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Old Jul 15, 2006, 05:09 PM
Boffin
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Victoria, BC, Canada
Joined Apr 2001
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Quote:
Originally Posted by bjpaul
Perhaps they are overly concerned with the 3.6v per cell compared to 4.2v per cell with Lipo.
Right idea, but they want to tailor the voltage to match NiMH packs for car and boat racers. They have spent a fair bit of time getting the right motor and prop and don't want to start again with a new set of voltages.
The transformer is not a useful accessory for fliers.

Rick.
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