>In all honesty, A123 have to do fast recharge, if they didn't no one would be interested

Don't want to start a debate, but there are a few more advantages worth mentioning
. No need for an LVC or balancer
. Shorter Constant Voltage phase while recharging
. Will last a few hundred cycles longer
. Easier to reconfigure/assembling
. More secure: No fires, explosions, puffing ...
. I'm not worried when i subject A123 cells to water/snow
and so on ... simply fool proof

Of course lipos will remain unmatched when it comes to performance/wheight ratio.

what r the best places to find a123 cells?? any1 have experience with hobbycity cells?

If it says A123 on the label thats all that matters- stay away from more generic looking versions that just say li-ion or lifepo4 without the A123 badge.

Best bet for genuine A123s is tanicpacks.com, though hobbycity do cell individual cells too yeah:

clicky

The prices have gone up quite steadily for a while, I remember when they were more like $10 about a year ago, it was just the high shipping costs that was annoying back then...

And now, the disadvantages:

- Relatively heavy, especially in 2P mode.

- Resulting pack can be large and difficult to fit into typical battery trays, depending on vehicle.

- Really needs to be in 2P mode for decent runtime and constant current output. You could get by with 1P if in a light vehicle and/or run HV instead to reduce current.

Very true. For some setups/intended uses the a123 cells just fit the bill perfectly. For others lipo works better.

Lifespan is not something I usually think of, but for someone who only has 1 rc and plays with it alot it can be a big deal. I have never worn out a lipo... Usually change the setup and sell it or take it apart to make a different pack.

I am usually trying to get the weight down, and jsut find that lipo packages easier... But that is just my personal feelings. I think that the a123 tech will be the gateway to better electric storage for homes and full size cars. They just need to scale up the packs to car battery size. Imagine what a 50 pound a123 pack would be capable of.

sry to be thread jacking here but can any1 tell me the dimensions of these cells?? thnx

The traditional 2300mAh cells are 26mm x 65mm. The smaller ones (1100mAh) are 18mm x 65mm.

thnku sir