Place them in the slow cooker and add the apple cider vinegar. Stir until the apples are coated.
Cook on low in the slow cooker for 10 hours.
Add the sugar and spices and stir well.
Cook another 4 to 10 hours.
Blend with a hand blender to smooth out the consistency if needed.
Cook, uncovered for 1 to 2 hours on high until you've reached your desired thickness.
Notes
My recommendation is to start cooking this at 5pm on a Friday or Saturday evening. Let it cook overnight on low, then add the spices at 8am the next morning. Cook it on low for another 4 hours, then blend it, and cook it on high without the lid until it thickens up. Cooking times are flexible, so if you are off by a couple hours here and there, it's really no problem.