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Old 02-14-2009, 09:44 PM   #1
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Default A nifty new cell for 1/12 scale (maybe)

A guy was in at our hobby store (RCP in Madison) today and informed me of these cells. He is apparently one of the first to import these into the US.

Specs for single cell:
Nominal voltage ------ 2.4v
Capacity ------------ 4200 mAh
Size -----------------65x95x13
Charge time to 90% - 5 minutes
Cycle Life ----------- 5000 cycles
Energy Density ----- 50.4Wh/kg

Might make a perfect 1/12 scale pack in a 2S form, if it would fit.

http://techon.nikkeibp.co.jp/english...071212/144076/
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Old 02-15-2009, 02:45 AM   #2
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The current capacity and nominal voltage of the cell are 4.2Ah and 2.4V, respectively. Its dimension is approximately 62 95 13mm. And its weight is about 150g. Therefore, its energy density is about 67.2Wh/kg (131.6Wh/L).
A 2S pack seems to be too tall and heavy for 12th scale. 300gr is more than a Nimh battery pack.

I think A123 cells are the way to go...
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Old 02-15-2009, 02:53 AM   #3
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the crushing test is quite impressive, i have to say.
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Old 02-15-2009, 04:17 AM   #4
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Originally Posted by Der Dicke View Post
A 2S pack seems to be too tall and heavy for 12th scale. 300gr is more than a Nimh battery pack.

I think A123 cells are the way to go...
Average 4600 subc is 72g X 4 + 288G.....300 does not seem bad
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Old 02-15-2009, 06:10 AM   #5
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Very interesting...Li4Ti5O12 doesn't exactly roll off the tongue, but hell, if the packaging works and the price is right.
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Old 02-15-2009, 06:54 AM   #6
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We saw these a long time ago. Interesting cells but there are a lot of questions still. They've been tested at 10C so IR might be an issue.
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Old 02-15-2009, 07:07 AM   #7
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We saw these a long time ago. Interesting cells but there are a lot of questions still. They've been tested at 10C so IR might be an issue.
Fred,

I am very surprized you do not have these cells and performed extensive testing on them already. You are always 2 steps ahead.
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Old 02-15-2009, 10:18 AM   #8
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the crushing test is quite impressive, i have to say.
defnitly wouldn't want to pick it up at ~200*


we will all be using these soon...
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Old 02-15-2009, 12:00 PM   #9
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Originally Posted by sportpak View Post
Very interesting...Li4Ti5O12 doesn't exactly roll off the tongue, but hell, if the packaging works and the price is right.
how about Li-To?
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Old 02-15-2009, 12:38 PM   #10
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The only way people are going to happy is if they can make these into rounds cells that have a nominal voltage of 1.2 volts and charge on any charger.

Who are we trying to fool?
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Old 02-15-2009, 12:41 PM   #11
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The only way people are going to happy is if they can make these into rounds cells that have a nominal voltage of 1.2 volts and charge on any charger.

Who are we trying to fool?
Then how did lipo ever become the rage?

If you mean in 1/12th specifically, the problem with lipos is the voltage. These things are 2.4 which is perfect. 2 cells instead of four or one with 4 cell NiMH voltage. Something like this just might work. Then again, maybe not.
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Old 02-15-2009, 01:14 PM   #12
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Also, two indivisual cells leaves some love for the t plate crowd.

As far as price goes, it will decrease drastically as the technology becomes more and more standered... Just like everthing else.
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Old 02-15-2009, 01:35 PM   #13
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As far as price goes, it will decrease drastically as the technology becomes more and more standered... Just like everthing else.
Time will tell like most things, there will probably be some other technology within the next few years if not months. Price will only come down but technology costs!
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Old 02-15-2009, 06:41 PM   #14
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Don't count on these cells making it big anytime soon.

The reason is because majority of the batteries in development are for battery back-up systems, off-grid systems and Electic and Hybird vehicals. RC is an after thought for use of batteries.

These batteries are 2.4V nominal voltage and require a charge controller. An electric car will have voltages from 200 to 500V and by having a nominal voltage lower than Li-Ion or Li-PO, you will have to incrase the charge controller channels by 50% increasing the cost. Extra cost will decrease the likelyhood these batteries are going to make full scale production. For small stuff like laptops and power tools, Li-Ion has shown to be well suited, taking away the need for SCiB batteries.

I know many will say that 1.2V NiMH and NiCD are used in EV's and that would require twice as many channels on the charge controller as the SCiB 2.4V batteries. The difference is that the NiMH batteries are grouped into normally 12V or 6V groups for each channel of the charge controller. The reason is because NiMH/CD can somewhat withstand a little extra during the charge process. This would be similar to how hobbyist currently charge a 7.2V NiMH battery pack without montitoring each cells voltages.
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