Wondering if anyone could tell me how long the batteries in the Matrice 600 Pro's controllers last?

Also is there a way to charge them in the field of another battery?

Thanks!

It depends on how active you are and whether you're using dual video out, but you could get more about an hour or more in battery life. It's a 2S, 6000 mAh battery, so it won't go as quickly as the flight batteries will. The RC's battery cannot be replaced in the field, not without voiding the warranty.