If the firmware for the current battery needs to be updated, DJI GO will display an inconsistent firmware found message. Tap that message to update the firmware. Each battery needs to be updated separately.
Two days ago I updated my 16 months old MP with the latest firmware using latest Dji go 4, I never update before. And yes, the batteries need to be updated to make the consistent with the Aircraft and the rc.
I recently purchased a new battery as I junked 2 of my three that were swelling. I had to do a update on firmware etc...
Since 1 batt is over a year and 1 brand new, should I update the older one?