iPhone 15 battery health and charging

Charging: USB-C (USB 2 on the 15 and 15 Plus, USB 3 on the Pros), about 20 W to 27 W with a Power Delivery adapter. Wireless: MagSafe up to 15 W, Qi2 15 W, Qi 7.5 W.

Updates: Runs the latest iOS, with many years of updates ahead.

How to check iPhone 15 battery health

1. Open Settings › Battery › Battery Health & Charging (on iOS 17 and later it may be Settings › Battery › Battery Health). Maximum Capacity is the battery’s health.
2. Open Settings › General › About to see the cycle count, the manufacture date and the date of first use.
3. If Peak Performance Capability says the phone had an unexpected shutdown, performance management is on: the battery can’t deliver peak power and needs replacing.

What to know about the iPhone 15 battery

• The first iPhones that show the battery’s cycle count, manufacture date and first use: Settings › General › About. Apple rates these batteries to keep 80% of capacity at 1,000 cycles, double earlier iPhones.
• USB-C replaces Lightning, so any USB-C Power Delivery charger works. If it won’t charge, try another USB-C cable: cheap cables are the most common cause.
• Settings › Battery › Charging can cap the charge at 80%. A phone that stops at 80% is set that way, not faulty.

iPhone 15 won’t charge: what to try

1. Try another USB-C cable and charger you know work. A damaged cable is the most common cause.
2. Clean the port. USB-C ports fill with pocket lint that stops the plug seating fully; ease it out with a wooden toothpick, never metal.
3. Restart the phone. A software glitch can stop charging until the next restart.
4. If it stops at 80%, that is Optimized Battery Charging or the charge limit, not a fault. It resumes later or can be turned off in Settings › Battery.
5. Try wireless charging, if the model supports it. If wireless works and cable doesn’t, the port or its flex cable is the problem, not the battery.
6. If it drops from 20–30% to off, or shows a sudden jump in percentage, the battery is worn and needs replacing.

Still not charging? Open mxmob.com/check and run the charging test: it shows the instant the phone sees power, so you can tell a dead port from a dead battery. Our battery test shows the charge level, charging state and estimated time to full.

Buying a used iPhone 15?

Ask the seller for a screenshot of the battery health screen before you travel. When you meet, run the free hardware test on the phone itself, check the IMEI with our IMEI checker, and see our price checker to know what a fair price is. A battery under 85% is a reason to ask for less, not always a reason to walk away.