200+WATTS from an 88.5g Lead-acid battery! - RC Groups
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Feb 19, 2005, 08:21 AM
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200+WATTS from an 88.5g Lead-acid battery!

Anyone who have tried it?
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Feb 19, 2005, 08:44 AM
Motors beat engines!
On the surface they sem heavy and low capacity, however, they also put out about 50% more volts under load than a nimh would, and have the ability to handle high currents.

I would think that 6 of these would be roughly the equivilent volts under load as a 9 cell gp3300, and weigh a bit less, but have much less capacity under load, 0.6 amp hours instead of 3.3.

I doubt if they would be much use for e-flight, but if they're cheap enough, maybe could make up a field power source from them?

Dean in Milwaukee
Feb 19, 2005, 08:48 AM
Registered User
It can't be a traditional lead acid battery because its nominal voltage is 2V/cell. Lead acid voltage is 1.5V/cell. If there's a single cell in that can, there must be some new chemistry here.

If they're seriously suggesting that you can discharge it at 500A and that it will survive 1000A for short periods, there's defininitely something new here.

It's not April Fools Day in China today is it?
Feb 19, 2005, 08:54 AM
Average User
M Ashmore's Avatar
Traditional lead acid is 2V/cell.
Feb 19, 2005, 09:53 AM
sloping addict
Protocooler's Avatar
Every VRLA lead acid battery has 2 volts/cell voltage. Any 12V battery is made of 2v cells.
However usually the short circuit current is above 1000A only for batteries larger than 15-20 Ah weighting more than 6 kg.
50A is usually nothing for a lead acid batteries but it is virtually impossible to have 1Ah for less than 300g. Herebelow are some of the best (highest density) lead battery and the smallest 8Ah still weights 2.7 kg.

So they would have managed to increase 3 folds the energy density as well as reducing the internal resistance. But still that yields less energy than a single GP2200 or 3300 (up to about 140A @ +/- 0.75 V) with more weight and about 5 times less capacity. So not too interesting for us.
Maybe for an embarked glow batt in a glow plane!

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