What is the life of a pacemaker?

This video talks about the life of a pacemaker by Dr. Aparna Jaswal, Cardiologist, Fortis Escorts Heart Institute. She discusses that pacemakers longevity depends on the type of pacemaker and also on the usage of an individual patient. The types of pacemakers are: Single-chamber pacemaker, Dual-chamber pacemaker, Biventricular pacemaker. Biventricular pacemakers lasts little less than single and dual chamber pacemakers because their current utilization is more and their battery usage is also more than the other pacemakers. 
Pacemakers have a longevity of approximately 7 – 12 years.