I will step in to respond on Mach's behalf...

He uses the clasic DeWalt pack cells, i.e. 2300 cells in 10s2p

So far testing with 6 T HiRotex outrunner, but propped up (from 20x11 to 22x12)

Data logging to be done soon

So far quite a good impression (better than expected), good for 9 minute flights, Mach says "I would like to have some 5% of power more and it would be perfect".

The available power seems to stay constant or even feels like going slightly up throughout the flight.

Mach is experienced F3A competition pilot of many years, who used to fly all kinds of glow, gas, you name it, and he was the Czech electric F3A pioneer since 2003. He also manufactured the Rhapsody for Jason Shulman to fly at the WC in Poland.

Experiments will follow with a new version of HiRotex, also it would be nice to borrow the Hacker XL 12 for few flights.

Obviously the A123 is missing a bit in the Wh/kg parameter, but has 2 advantages: full charge in exactly 30 minutes, and maybe, just maybe, much longer cycle life compared to Lipo.

We surely hope that the technology may be developed a bit further.