Punchbuggy
Captain
Flight distance : 483166 ft
Australia
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Battery firmware is not separate, and is incorporated within each specific craft's firmware.
Late last year, DJI released a P4P firmware version with an optimised battery firmware (the version before the current, I think). DJI have since then not released a P4 firmware version which incorporates this same battery firmware level - but it's incorporated in the next (I confirmed this with the P4 Beta in January, which I'm now sitting on as I have no choice but to). Sadly, you'll have to wait for the prod release of the next P4 firmware to have this resolved.
In the meantime, whenever you receive an 'incompatible firmware' message after you move a battery between models, the only option is to refresh the craft firmware (to apply the compatible firmware for the installed battery).
[edit]: You know when a craft firmware has incorporated a new battery firmware version and the battery is being updated, when the two middle LEDs on the battery start flashing.
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