Hi, my partner had a pacemaker and defibrillator fitted in December 2020. He went for his second check up today and was told that his heart is working harder, so much so, its draining the battery. Where a normal battery would last around 10 years, his is showing that it only has 5-6 years left. They made some adjustments and want to see him again in a month but said it is likely that they will have to operate again. I can't find anything on line about these symptoms and wondered if anyone else has experienced similar?