There are two types power sources for watches. Automatic and battery.
Automatic needs to be either wound by the crown (winder on the side) or wound by the movement of the wrist while it is worn.
The battery powered is self explanatory.
Since you didn't include the model it's difficult to say for sure because Relic makes both automatics and battery powered watches. Although I can tell you is most automatics will clearly labeled. If your watch say automatic somewhere on the face or back you need to contact Relic for service because your watch has a 12 year warranty.
To prevent violating your warranty a jeweler should be the one who replaces the battery if it is battery power.
I included the link to Relic watches below for info on the warranty and instructions.
Hope this helps.
http://relicbrand.com/