Ditto going with multiple packs vs one big one. My big birds all use the same packs in various combos, 90" P38 uses 8 3S3700's wired in series/parrallel configs to give me a 6s2p set up in each boom, The Hanger 9 Camel uses 2 of the packs for a 6S1P set up, same with my P40, my Hanger 9 Cub uses just one of them. All may smaller birds use combos of 3s2100 packs to motivate them.

Makes it so much easier to only deal with 2 types of packs vs a seperate pack for each bird.