My iPhone X battery health came down to 90% with in 7 months of time what would be the reason & should I opt for battery replacement because I see some lag
![Maximum battery capacity showing -- after replacing (2weeks over) iPhone 6 battery under Apple's battery replacement program. Is this a defective battery? : r/ios Maximum battery capacity showing -- after replacing (2weeks over) iPhone 6 battery under Apple's battery replacement program. Is this a defective battery? : r/ios](https://preview.redd.it/b1jhsa2mp8511.jpg?width=640&crop=smart&auto=webp&s=020c51dc65e45c5d333ebebebe6c7e84f6c58921)
Maximum battery capacity showing -- after replacing (2weeks over) iPhone 6 battery under Apple's battery replacement program. Is this a defective battery? : r/ios
![When should I replace my iPhone's battery? How to use Apple's battery health features - AppleToolBox When should I replace my iPhone's battery? How to use Apple's battery health features - AppleToolBox](https://appletoolbox.com/wp-content/uploads/2017/12/iPhone-Batteyr-health-important-message.jpg)