I agree with Dale, doing the updates and battery maintenance on 2 drones is enough for me.
Granted every DJI drone update is positive, but if you have a capable drone or 2, how much ability are you really gaining?
Charging and discharging the batteries will keep them alive.
I learned the hard way. I haven't been flying much lately so I will charge my batteries fully then go out to the park (a local dam) and practice basic moves from a high vantage port.
I...