To keep your iPhone battery health as close to 100% as possible for a long time, follow these expert-recommended practices:

Key Tips to Maintain iPhone Battery Health

• Avoid Extreme Temperatures: Keep your iPhone between 62°F and 95°F (17°C and 35°C). Avoid exposing it to heat or cold, as temperature extremes accelerate battery degradation

• Optimize Charging Habits:
  • Enable Optimized Battery Charging (Settings > Battery > Battery Health & Charging) to reduce the time your battery spends fully charged, which slows aging

* Avoid charging your battery to 100% regularly; instead, keep it between about 20% and 80% most of the time

* Do not let the battery drain completely to 0% frequently, as full discharges use up charge cycles faster

* Avoid charging overnight or keeping the phone plugged in continuously after reaching 100%

* Use Apple-certified or high-quality chargers and cables to prevent battery damage

• Use Low Power Mode: Activating Low Power Mode reduces background activity and screen brightness, conserving battery and reducing wear

• Manage Screen Brightness: Lower screen brightness or use auto-brightness to minimize battery drain, as the screen is a major power consumer

• Limit Background Activity: Disable unnecessary background app refresh and location services for apps that don’t need them to reduce battery consumption

• Keep iOS Updated: Install the latest software updates, which often include battery performance improvements

• Avoid Heat During Charging: Remove the case if your iPhone gets hot while charging to prevent heat buildup that harms the battery

Additional Practical Advice

• Occasionally allow the battery to fully charge and discharge to recalibrate the battery gauge, but avoid making this a habit

• If you store your iPhone for a long time, charge it to about 50% and turn it off to preserve battery health

Summary

While it’s impossible to keep an iPhone battery at 100% health indefinitely due to natural chemical aging, these practices can significantly slow down battery degradation and extend its lifespan. The most effective measures are to avoid extreme temperatures, optimize charging cycles with features like Optimized Battery Charging, keep the battery between 20-80%, reduce screen brightness, and use Low Power Mode when needed

. Following these guidelines will help maintain your iPhone battery health near 100% for as long as possible.