Superior Protection Services  - hybrid battery not covered under warranty

This is a poor excuse for a warranty company just got off the phone with dealership and they said my 2010 Chevy Silverado hybrid battery was bad and they contacted the warranty company and they say they don't cover the battery it's 3700$ this is not right I had a friend there warranty company covered there's this is definitely not right so the battery in a hybrid is like the motor in a normal vehicle how is it not included in the warranty not even a partial coverage