Your Take on these LiFePo4's
I saw these on ebay:
I realize they are only 10AH -- which is enough for my application (barely)-- but they have the advantage of being able to be hand-assembled, are easily expanded in the future (easy to go from 36V to 48V, for example) and have a decent-C rate (15A continuous, 100A max).
Do you see any disadvantage in this approach?
Just that you need to come up with your own bms. Some folks are working on it, but I haven't seen one readily avaliable that does the kind of discharge rate this battery does. You can run em without bms, but will need to really watch the discharge carefully so you don't toast cells. With lifepo4, that can be about a block of riding between ok and oops I ruined a cell or two. So to be really safe, you will need to get charged pretty frequently, but this battery is, I belive, able to really fast charge.
The other disadvantage is the cost. If you have a under 1000 watt bike, just get a Ping 20ah for a lot less money.
Reading more thouroughly, they say they can provide a bms and charger. Cool. Funny they don't mention how much, or post em on ebay though. I think we'll all be running cells with this kind of performance someday.