DJI's intent was to have the FC actually process the data from the RC as part of the sim, that way any changes to gains and tuning can be run in the simulator.
But yes, quite complicated for an app.
Definitely go out and buy more batteries, one will not be enough.
I run 2 TB48s alongside the original 47, absolutely bare minimum.
Two new 48s arriving today fingers crossed,more good news DJI has accepted my warranty claim so now I'm just waiting on my supplier to respond and post my battery replacement I'll keep you posted Thankyou Jamie.