How do I keep my iPhone battery healthy?
Practical, source-backed habits that slow iPhone battery aging: moderate temperatures, software updates, optimized charging and correct long-term storage.
✓Sources reviewed 2026-09-10
Short answer
Battery health is about avoiding stress, not perfect charging. Apple's guidance: keep the iPhone within 0°–35°C (32°–95°F) ambient, avoid charging in heat or direct sun, keep iOS updated, leave Optimized Battery Charging on (add a Charge Limit on iPhone 15 and later if you like), remove a thick case when the phone warms, and for months of storage leave the battery at about half charge in a cool place.
Why
- Battery aging (Apple calls it chemical age) depends on temperature history, charging pattern and charge cycles — moderate temperatures and less time at a full charge slow it down.
- Software updates include charging and thermal management improvements, so keeping iOS current supports battery behavior.
- Optimized Battery Charging (default on) reduces time spent fully charged; iPhone 15 and later add a Charge Limit between 80% and 100%.
- Genuine batteries and compatible accessories preserve capacity reporting, performance and safe charging.
- For long-term storage Apple recommends about a 50% charge, powered down, in a cool dry place, topped back to 50% roughly every six months.
Important conditions
- A battery is a consumable: even with ideal care, capacity declines with use and age, and Apple recommends replacement when a service message appears.
- Avoid leaving the iPhone in a hot car or direct sun, or fully discharged for long periods.
- When a battery needs replacing, use a genuine Apple battery fitted by Apple or an Apple Authorized Service Provider (Self Service Repair where available).
What to do
- Update to the latest iOS.
- Keep Optimized Battery Charging on; on iPhone 15 and later, optionally set a Charge Limit under Settings → Battery → Charging.
- Avoid using or charging above 35°C ambient, and remove thick cases if the phone warms during charging.
- Store long-term at about 50% charge, powered off in a cool dry place, and recharge to 50% about every six months.