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Old 03-22-2009, 04:23 PM   #1
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Default Lipo vs A123

So I have been talking and reading and I wonder what you guys think. I have heard that the A123 are safer/last longer/cheaper. But that they are heavier than the LiPo's.

What do you guys think about this?

I was thinking about getting a A123 for my E 8th scale when I order everything.

Let me know the pros/cons


Thanks

Josh
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Old 03-22-2009, 04:38 PM   #2
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For the same amount of power (Watt_hours), A123 cells are heavier. They are by far a safer technology, but they don't have the power density of Lipo. They are also an odd size for many land based rc applications. On the plus side, they can be fast charged (some lipos can too).
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Old 03-22-2009, 05:19 PM   #3
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Quote:
Originally Posted by kufman View Post
For the same amount of power (Watt_hours), A123 cells are heavier. They are by far a safer technology, but they don't have the power density of Lipo. They are also an odd size for many land based rc applications. On the plus side, they can be fast charged (some lipos can too).
Oh so the main difference is the charging and safety? I heard somewhere that compared to the same Mah Lipo they lasted longer. Just curious, Thanks for the informative reply


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Old 03-22-2009, 05:28 PM   #4
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I run them basically because I was able to source the cells out of 36v Dewalt power tool pacs and the pacs I built were incredibly cheap. My 5S1P pacs cost me $55 each with the shrink and balance wiring. They are heavy - not quite as heavy as a 6 cell NiMH pac, but close. They are also big - there will be places you can't run them or have to configure them in tubes to minimize size - as a side by side pac, they're larger than 6 cell NiMH in sbs.

They are lower voltage, 3.6v as opposed to lipo at 4.2v/c. Generally not a prob - if you would run 4S lipo, you run 5S a123 since its similar voltage. To generate capacity, I built pairs of pacs - when I run 5S1P, I use 2 wired in parallel so I have 4600mah capacity. I charge my a123s at 10amps and they're usually ready to run in about 20min, about 1/3rd time of a lipo. Also the graphs I've seen on life vs charge voltage tell me to expect about 1000cycles, so they're supposed to last longer than a lipo. Right now, if I had to buy cells heads up from A123, not sure I'd go that route.
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Old 04-07-2009, 06:37 PM   #5
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Running A123 6s2p in the Savage Flux. The batteries are solder up end to end. You can fit a 3s2p pack in the side battery boxes if you remove the lid and use Velco straps. Connecting these with the standard wiring gives you the 6s2p and you will have all the speed you want.
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