Have you guys ever looked at the 103450 size lithium ion batteries? These is what I use in my Transmitters. 3 of the fit easily in my airtronics. I harvest them from old laptop batteries.
6 KiloWatt A123 Racer
GTP-Pletty Big Maxximum+RX8. GTP-C50-6L Hacker+RX8. CRT.5-Pro4+ZTW esc.
24s2p EVG SX 49.6mph Ebike.
18s4p Raptor 60mph Ebike. 11.5KW