S5 Repair and S0 Updates

My Series 5 battery health was at 72% so I decided to send it in instead of buying a new one. I’ve never used Apple support for my watch before. Does “replace” mean a new watch? And if so, how do I transfer cellular?

My Series 5 battery health was at 72% so I decided to send it in instead of buying a new one. I’ve never used Apple support for my watch before. Does “replace” mean a new watch? And if so, how do I transfer cellular?