Can you replace your battery
When your batter health goes under 85 can you replace it ?
Question marked as
If you mean can you personally, you don't want to, particularly if you have a device less than 5 years old.
The link below takes you to a document about 'iPhone Battery & Power Repair' outlining battery replacement, cost, and time to repair.Click here --> https://support.apple.com/iphone/repair/battery-power