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Old Sep 20, 2001, 09:37 AM
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asperkins's Avatar
Arlington, TX, USA
Joined Jun 2001
455 Posts
8.5 oz - 7.6v - 4,360Mah battery!!!

This is a very exciting technology. LITHIUM ION POLYMER batteries. There was a review of these in the latest RC Microflight. Only a couple of sizes are shipping currently. But Valence is making a 4,360 Mah 3.8v pack that weighs 4.26 oz. These batteries can handle an amp load of 2C so you can get almost 9 amps out of the 4360. Put 4 in parallel and you have a 17,440 Mah battery that can handle a 36amp draw.

Also they have built in overcharge/discharge protection. A couple of the companies making them are considering selling to the hobby industry. For slow flyers they have some really neat packs as well. Like a 500mah battery that weighs .4225 oz. The 500 would be able to handle a 1 amp draw and a 7.6v pack would weight .85 oz.

More info here http://www.valence.com/products/index.htm
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Old Sep 20, 2001, 06:08 PM
Quacker's Avatar
United States, CO, Longmont
Joined Jul 2001
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The energy to weight ratio is near identical to the Li-ion cylindrical cells made by Panasonic and others.
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Old Sep 20, 2001, 06:15 PM
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Arlington, TX, USA
Joined Jun 2001
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From the article...

The life of the cells can be around 600 cycles; the lithium-metal cells seem to provide only around 300 cycles. The charge times for lithium-polymers are also much better than for lithium-metal cells—2 to 3 hours, compared with 5 or 6. Although it is possible to charge the lithium-metal cells at the same rates as the polymer cells, by doing so, you reduce their lives to around 150 cycles or fewer. It is not certain which sizes will be useful or how the lithium-polymer batteries will be applied, but they are aggressive, safe and reliable.
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Old Sep 21, 2001, 12:43 AM
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ETKing's Avatar
Southern California, USA
Joined Sep 2001
388 Posts
Lithiums are light!

I've got surplus sony Li ion batteries from a cell phone, and the charger designed for them. 7.2 V, 1200 mah, 2.8 oz. Removed the protection circuit after it kicked in two times while bench testing. Charger is regulated at 8.40 V. Sony literature says they can do 2C discharge. Surplus are very affordable too.

They should do great in my new lite stik.
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Old Jan 03, 2002, 07:15 PM
Hey, I wanna fly too!
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United States, TX, Justin
Joined Sep 2001
223 Posts
Re: 8.5 oz - 7.6v - 4,360Mah battery!!!

Quote:
Originally posted by asperkins
Put 4 in parallel and you have a 17,440 Mah battery that can handle a 36amp draw.
So what would you do with 17.04oz, a bit over 1 pound of batteries that only puts out 3.8 volts? You got to put 'em in series to add up the voltage...

I'd be happy to have a 1oz battery that would handle 9-amps at say 1500mA. Do a 16 cell, 4×4 matrix and you'd be at 16oz, 36 amps, 6000mAh AND 15 volts . Now that would be cool in the E3D

Terry
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Old Jan 03, 2002, 08:27 PM
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Berkeley, CA USA
Joined Apr 2001
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Re: Re: 8.5 oz - 7.6v - 4,360Mah battery!!!

Quote:
Originally posted by tphillips


So what would you do with 17.04oz, a bit over 1 pound of batteries that only puts out 3.8 volts? You got to put 'em in series to add up the voltage...

I'd be happy to have a 1oz battery that would handle 9-amps at say 1500mA. Do a 16 cell, 4×4 matrix and you'd be at 16oz, 36 amps, 6000mAh AND 15 volts . Now that would be cool in the E3D

Terry
It would be just as kewl in a combat robot. What i could do with that...
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