I know your CT is out of criteria for the year by year, up to 10 yeas/100,000 miles warranty but by having the annual hybrid check carried out it does extend the warranty on the hybrid system and battery for another year up to 15 years.
see below, copied from the Lexus UK site.
Lexus warranty and hybrid vehicles
For customers with hybrid vehicles, the Hybrid Health Check forms part of the scheduled servicing. The warranty includes cover for the hybrid battery and components for up to 10 years/100,000 miles. After this time, customers can still extend the cover for up to 15 years with a stand-alone scheduled Hybrid Health Check.