Add all ingredients to slow cooker and cook for 6 hours on low.
Halfway through cook time, use a spoon to "pop" as many cranberries as are easy to pop (minimal effort). You want to leave several whole cranberries.
At the end of the cook time, again pop more cranberries and stir. This should come together as a thicker relish. Remove cinnamon sticks (can be used for presentation if desired).