I think all of us who participate in forums like this one, we care about the rules and the laws. But DJI doesn't make the drones for those of us who are tiny minority. Let me understand what you are saying since I did not know exactly how the
Mini 4 Pro handles RID. You are a recreational flyer with both standard (regular) and extended batteries which you switch back and forth with. When you switch, the standard battery does not transmit RID and the extended battery does transmit RID. We all agree the
Mini 4 Pro with the extended battery is greater than 250g and with the standard battery is less than 250g.
A word about terminology: the
Mini 4 Pro is always "RID compliant." There is an RID DOC on file at faa.gov and it lists your drone model and serial number (range) so it is technically "RID compliant." Your real concern is whether you are flying legally...or not. If your drone was not RID compliant, then you would need to look into attaching an approved external RID module to it when flying commercial or when flying with the external battery (which takes it over 250g).
When you register your
Mini 4 Pro with the FAA as a recreational flyer, you are technically legal to fly it regardless if you fly with the standard battery or the extended battery. In my opinion, this is true because your drone is greater than 250g when you fly with the extended battery and your drone is registered and it transmits standard RID properly. In my opinion, this is true because your drone is less than 250g when you fly with the standard battery and there is no regulation that I am aware of that says you MUST be registered, even though you are currently registered. AND there is no law that says your drone has to transmit RID when you are flying recreational and under 250g.
The only exception I can think about is this; someone might say this but I don't necessarily agree with it: if your drone is registered in the FAA database and your drone is listed as
standard RID-complaint, then you are obligated to transmit RID whenever you fly it. I believe that despite these facts, when you are recreational and you are under 250g, you are not required to transmit RID. My point is, the active database registration listing PLUS the FAA DOC does not decide whether you must transmit RID so therefore when you insert the standard battery into the
Mini 4 Pro and it shuts off the RID as it brings the weight down under 250g, you are still good to fly.
Sorry for the long answer.