I bought my phone on April 1st week, 2024. In September battery was 96% cycle count 260. Now after 1 month battery health is 90% in cycle count 300. I am using my phone everyday4-5 hours and maitaining 20-80 charging. I didn't play any kind of games in my device. My question is why apple claim 1000 cycle count and 80% will be? And how to solve this issue?
Welcome to the forum.
But this is a forum for developers to get help on their app development, not about product issues.
You'd better ask on the support forum: https://discussions.apple.com/welcome
For help with iPhone battery, please post in the Apple Support Community. The Apple Developer Forums are for questions about APIs and features intended specifically for developers.