The Gremsy S1 package includes:
No, it does not. The S1 supports the external batteries from a drone with 12 - 52V input power.
No, It is not
Gremsy S1 supports only normal operation.
Yes, you can disassemble Gremsy S1 under drone. In our setup, we use the Adapter Hyper QR to Circular QR and Circular Quick Release supported.