I noticed the TB48 is 5700 mah BUT is higher voltage at 22.8
whereas TB47 is 22.2 VOLTS
Looks like DJI went with stock battery as TB47 due to air mail restrictions on batterries above 100 WH

TB47 is 99WH
TB48 is 129.96 WH

I find my Bird flies better with TB48 due to higher voltage? 22.8 vs 22.2 v anyone else notice that?

It should not make any difference because its always the errr, (Verbraucher) sorry i don't know the word in english, the tool that needs the energy that pulls not the battery that pushes. So the inspire will only take what it needs.
Much more important are the maH.