Looking 7.4 battery and a charger for the cbr myself, after a bit of research I've found these
https://hobbyking.com/en_us/turnigy-nano-tech-1400mah-2s-15-25c-lipo-airsoft-pack-1.html
https://hobbyking.com/en_us/imax-b6-ac-charger-discharger-1-6-cells-1.html
But it seems very cheap, are these...