My opinion would be no on only using one large battery. I don't know what motors you're running, but on mine. ...ive got two power 60s turning 16x10x3s. With two 6s 5000s in parallel, that's 10000 mah of capacity. I get 6.5 mins of flight time.
I can see running one battery on the dynam plane because it's significantly smaller and takes less power.
Another reason to run two packs in parallel is if one battery overheats, drops a cell, or suffers something else going wrong, the other battery is still supplying power to the motors.
If only one huge battery, then on a battery failure, that's it.... Deadstick.
And yes... .Run a separate rx battery.
Replacement costs for a 5000 mah battery is far less then a 8000 or 10000. Additionally, you're spreading the amp draw between two packs in a parallel setup instead of overworking one giant battery. Longevity will be better on pack life using two batteries.
Last edited by Katniss; 02-09-2018 at 07:54 PM.