My P3A has the latest firmware, but I bought an extra battery.
How do I have to upgrade the new battery.

Regards
Siep

Just as you would upgrade the aircraft. Insert the new battery and load the .bin file with the latest update onto the micro sd card. Insert micro sd into aircraft and then power up the aircraft. The update will ignore any files that have already been updated on the aircraft and upgrade the battery file if needed.

The resulting txt file will be stored on the sd card showing the results of the upgrade.

Hello Siep, battery's upgrading is the same as drone's upgrading and it uses the same firmware.

Thank you.