I have a 2012 S5 with the ultegra Di2 system with external battery.

Few questions.

How can I find out what model Di2 my bike has?

Can this Di2 system be updated to synco shifting via E-tube using the SM-PCE1?

Can this Di2 system be updated to the BT-DN110 internal battery and avoid buying the SM-PCE1?

Thanks!