To go for the official rating, up to the iPhone 14 it was 80% of the original charge after 500 cycles [0] and got improved (1000 !) later.
500 cycles can be a lot if you mostly keep it as a standby device to stay reachable, but not that much if you actually use the phone everyday.
That's less than 2 years if you completely drain the phone at least once a day. Our kid easily goes through two full charges in a day, especially on weekends. It really depends on what you use your phone for.
Also I think some people live with a < 70% battery without really minding it much. That's IMO only viable if you don't have a winter, where the battery efficiency becomes so worse. That's the combination of weak battery + poor weather that triggered the phone shutdown for me when BatteryGate was the rage.
500 cycles can be a lot if you mostly keep it as a standby device to stay reachable, but not that much if you actually use the phone everyday.
That's less than 2 years if you completely drain the phone at least once a day. Our kid easily goes through two full charges in a day, especially on weekends. It really depends on what you use your phone for.
Also I think some people live with a < 70% battery without really minding it much. That's IMO only viable if you don't have a winter, where the battery efficiency becomes so worse. That's the combination of weak battery + poor weather that triggered the phone shutdown for me when BatteryGate was the rage.
[0] https://support.apple.com/en-us/101575