Slow Cooker Beans and Sausage

2 cans great northern beans, drained
2 cans black beans, drained
1 large onion, chopped
1 cup BBQ sauce
1/4 cup brown sugar
1 T ground mustard
1 T Worcestershire sauce
2 teaspoons chili powder
1 or 2 ring of hilshire farms kelbausa (sp?) sausage

1) Mix all ingredients except sausage in cooker. Sink sausage(s) into the center of the mixture. Cook on Low for 6 hours.