My oldest Apple device, a PowerBook G4 (says copyright 2000 Apple Computer Inc on the bottom) can still play a Podcast for a few hours on its original NiMH battery, and I found a disposed of iPhone 4 that's pretty shattered yet still works fine and holds a better charge on a prepaid SIM than my 6S does. That's with iOS 7 too. Given its condition I highly doubt it ever had a battery replaced and it was found dead.
I had my iPad 3 for 5 years before selling it and it still held a great charge. My mom has an iPhone 6S she bought in 2015 and despite the Health showing 65% it still manages a day--two standby. She leaves it plugged in 24/7 when at home so that's likely what caused the 65% reading--has no real bearing on battery runtime.
Contrast that to my Galaxy S5 which had its original battery start to swell after a year, and my Dell Latitude Core 2 Duo that refused to charge past 0% after a year, and a Compaq Armada that needed the battery removed to power on with AC adapter connected two years into owning it. Apple products have super long life batteries.
I had my iPad 3 for 5 years before selling it and it still held a great charge. My mom has an iPhone 6S she bought in 2015 and despite the Health showing 65% it still manages a day--two standby. She leaves it plugged in 24/7 when at home so that's likely what caused the 65% reading--has no real bearing on battery runtime.
Contrast that to my Galaxy S5 which had its original battery start to swell after a year, and my Dell Latitude Core 2 Duo that refused to charge past 0% after a year, and a Compaq Armada that needed the battery removed to power on with AC adapter connected two years into owning it. Apple products have super long life batteries.