Upgrading brushless system

[coolhandcountry]

squee has the idea. You can get most charger for a 4 s pack to. Mah is not everything. With a 12 xl you won't need but 8000 mah to run a long time. 2 x 4s packs would be above the 9920 or 12020 capacity. 8 x 3.7v= 29.6 volts the 12 xl is not amp hungery motor. I ran a 9xl on 7020 esc. With this set up you probably looking at an hour play time.