My iPhone battery drops abruptly by 1% battery after every 3-5 days

MMUNEEBREHMAN wrote:

My iPhone battery drops abruptly by 1% batteryafter every 3-5 days .It started happening on IOS 17.5.1 update and it's frustrating. Although the 3u tools to check the phone's actual state shows 100% and settings analytics shows 97% for battery stats (another way to assess battery condition) but iphone battery settings under setting > batter> maximum battery health is showing 88%. I have 2 phones and this one is my personal one and average daily screen time is 3h 56m and I use the phone on low-medium brightness not high. Suggest any possible remedy

[Re-Titled by Moderator]

Reset or a Force Restart,

Force restart iPhone - Apple Support

Restore from backup, restore as new device.

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

Maximizing Battery Life and Lifespan

Batteries - Maximizing Performance - Apple

About Optimized Battery Charging on your iPhone

About Optimized Battery Charging on your iPhone - Apple Support

≤ 80% maximum capacity is when Apple suggests the battery is eligible for replacement

Check Device Coverage

Check Your Service and Support Coverage - Apple Support