a123 Lithium iron phosphate battery ok?

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Ok for what? Space travel?

Go electric!
Happy electric car owner / builder

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space , no too cold...

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Great battery

KISS - Keep It Simple Stupid!

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What is your application?

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They are good for high discharge applications. They were popular in the R/C heli community for awhile until the price of Lipos finally became sane. Nice thing about the A123 cells is you can charge them at 3C.

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Thats what they use in that electric dragster that holds all the 1/4 mile records. Tesla has 6800 A123 AA cells in cigar box size modules with custom cell V and T monitoring and charging and cooling. 380V worth I think.

Imagecraft compiler user

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About the Tesla roadster I've seen some movies. Looks great but expensive ($100k).
Lipo's are a bit cheaper and have some drawbacks.
Are there any alternative batteries that hold a lot of charge and are cheap?

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What application is this for ? what type of voltage and current requirements are there ?

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nick-123 wrote:
Are there any alternative batteries that hold a lot of charge and are cheap?

You do know about E = MC^2, don't you?

The deeper the capacity, the higher the cost.

So, in this case, E = $C^2.

You can avoid reality, for a while.  But you can't avoid the consequences of reality! - C.W. Livingston

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Carl,

haha

Guy,

Voltage of lipo's are 3.8-4.2V. Current can be as high a tens of C's. E.g. 2Ah can deliver 20-60A until almost empty. Note: They should not be sucked dry below 3.8V if you want a long lifetime.
The A123 are a bit different. I do not yet know much about them apart from that they can deliver a lot of current, have a long lifetime, can be charged quickly and are safe to use (in contrast to lipo's). Drawbacks are bit more expensive, holds less charge per weight.

Nick

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Yup the weight is why they lost popularity in the heli community. Lipos typically are rated at 20-30C these days. If you don't need 10's of ampere i would recommend nimh, until we know what type of current you require its hard to recommend anything.