Just got the 48V 20 AH LIFePO4 battery from Li Ping in China yesterday. Only took one week for it to get the SF Bay Area. It came with a 2 amp approx 60 volt charger. The battery is very compact-about the size of 3 12V 12AH batteries side by side. I get 5.5 inches X 4 Inches by 14 Inches. Weight is under 20 pounds.
I am running it in a modified Lashout scooter with the 48 volt 1000 watt brushless motor set up from Powerpack. The controller is a true 35 amp continuous. With a set of 12v 10.5 High rate Lead Acid batteries, I could go 29 MPH top speed, and ride at full performance in my hilly area for about 5 or 6 miles. Then it would go another couple of miles at reduced speeds. OK for running about the neighborhood, but not enough range for some serious errand running. I live where there is many 10 to 20% grade hills, some of them very long.
My goal with the Lithium pack was to extend the total range considerably, and also to knock 10 to 15 pounds off the scooter. I also wanted to be able to go 14 or 15 miles with no drop in performance.
Li Ping from Ping battery custom set up the pack for me with my motor and battery box parameters.
The BMS is set for 38 to 40 amps continuous, with 60 amp peaks. Yes, it is wrapped in duct tape, but after just getting back from a 14 mile ride at full speed, I can say the batteries live up to the stated claims-and no bad smells either. I got tired of riding after 14 miles so I came in, and measured the voltage of the pack at the end of the ride to still be 51 volts. My guess is I could go 20 miles total no problems, tripling the range form the heavier LA batteries. What is even better, is that I could still go full speed at the end of the ride. I actually improved my top end to 32 MPH from 29. Li Ping also told me the batteries will increase in performance after a few charge discharge cycles. The scooter did not cut out on me at all, even going up a 20% grade.
These batteries are available in many sizes, and Li Ping will custom make one if you need something special. Anyone waiting for quality Lithium batteries at affordable prices can stop waiting. My only concern would be for folks running very high amp motors.(like an Etec) I don't know if these batteries could be arranged to supply the needed output for those situations. I guess if you could fit them and ran twin 48V 20AH packs, you could double the continuous amp output to 80 amps.
I am thinking about a 36 volt pack to run with the 350 Watt Bionx kit. Bionx told me they would sell me that kit less their outdated over priced Lithium ion 36V 9.5 AH stock battery.
I am also still looking into 100AH LiFePO4 cells for a 120 Volt pack to power a small classic sports car for a project I'd like to start in a year or so.