
I’ve enjoyed my iPhone 15 Pro for two years now, and it still works about as well as the day I got it. But I know that at some point in time, it may wear out. Its lithium-ion battery will eventually refuse to hold a charge, as degradation via charging and time catch up with the device. The electrolyte inside will stop working, and it’ll be time to repair or replace the battery inside. I would know; I’ve done it twice before, once on my iPhone XR and once on my iPhone 12. I’ve never been too concerned.