Why no one asked soalan susah.

If i sold the car on year 2, and the battery lease remains 7 years.
What happened if the car remains unsold of 3 months? Does the new owner have to cover 3 months backdated (battery cost) before he can take ownership? If 3 months change to 6 month? Means the battery extension carry forward from 9 year to 9yr+3month / 9yr+6Month?