Doesn't this describe every
Mini 3 Pro flying out there right now under 250g? What rules are being overlooked?
Speculation: I think this all hinges on what the FAA defines as a, "standard remote identification unmanned aircraft" as the term is used in §89.310 and elsewhere in the regs.
I suspect the definition includes weight greater than 250g, and this is why compliant
mini 3 aircraft can be flying around broadcasting incomplete RID information, and yet have been approved by the FAA: They don't care.
Really, this is a tiny corner case. I can see why the FAA would just ignore this little bit of ambiguity.
Where there is a meaningful problem for the pilot is using a
Mini 3 with the lighter battery but made overweight with a strobe. This configuration can not be made flyable by adding an external RID module, as the regs require the built-in RID be used if present.
So, the extended battery
must be used to turn on RID. Not a onerous workaround, but functionally no different than a switch in the app for situations where the drone is over 250g but you want to use the lighter battery.
Maybe it's the last battery you have after using your extended batteries.