How to check battery health
Go to Settings › Battery › Battery Health (or Battery Health & Charging). "Maximum Capacity" shows how much charge the battery holds compared with new. On iPhone 15 and newer, Settings › General › About also shows the cycle count.
When should you replace the battery?
Apple designs batteries to keep about 80% of their capacity after 500 full cycles (iPhone 14 and earlier) or 1,000 cycles (iPhone 15 and newer). Below 80%, or if you see a "Service" message or unexpected shutdowns, it's time for a replacement. Use Apple, an Apple Authorised Service Provider or a reputable repairer, and ask whether the battery is genuine.
How to save battery
- Turn on Low Power Mode when you need to stretch a charge.
- Lower screen brightness or use Auto-Brightness.
- Check Settings › Battery for apps using the most power.
- Use Wi-Fi rather than mobile data where you can.
- Keep the phone out of heat (dashboards, direct sun).
iPhone not charging? Try this
- Try a different cable and adapter (look for MFi-certified or USB-C PD chargers).
- Clean the port gently with a wooden toothpick: lint is the most common cause.
- Force restart the phone (see the button sequence).
- If it says "Charging on hold", let it cool down.
- Still not charging? The port or battery may need repair.
Frequently asked questions
What is good battery health on an iPhone?
Above 85% is good; 80% is Apple's threshold for replacement.
Why is my iPhone not charging?
Most often a dirty port or a faulty cable. Clean the port, try another cable and adapter, then force restart.