No lithium ion battery lasts forever, so every Apple iPhone has a hidden “Maximum Capacity” setting to figure out the health of your battery. WSJ’s Joanna Stern investigates why her iPhone 14 Pro’s battery degraded down to 87% in just one year. Hint: Battery cycle counts. She also reviews your battery replacement and repair options. Chapters: 0:00 iPhone batteries go bad 0:52 Battery health numbers 1:41 Charge cycles, explained 4:24 Best battery replacements Tech Things With Joanna Stern Everything is now a tech thing. In creative and humorous videos, WSJ senior personal tech columnist Joanna Stern explains and reviews the products, services and trends that are changing our world. #Apple #iPhone #WSJ