I have two batteries for my Phantom 3 pro.  So far I have primarily used one of them to fly.  Recently I used the other and got a "Battery error" message in the app while flying. I could not see the battery level, only the error message was showing.  I did have to update the 1st battery's firmware before I used it.  I'm wondering if I have to do the same thing to the second, or how can I find out what the error was?

Hi, is that battery's updating result success? Could you provide some screenshots of this error and the battery status?