How to Check iPhone Battery Health (And When to Replace It)

If your iPhone battery drains quickly, shuts down unexpectedly, or feels slower than before, it might be time to check its battery health. Your iPhone includes a built-in Battery Health feature that tells you how much capacity your battery has left and whether it can still deliver peak performance.

In this guide, we'll explain how to check your iPhone battery health, what the numbers mean, when you should replace your battery, and how Star Phones can help restore your iPhone to like-new performance.

What is iPhone Battery Health?

Battery Health is a measurement of your iPhone battery's maximum capacity compared to when it was brand new. As batteries age, they naturally hold less charge, which means shorter battery life and reduced performance.

Apple uses lithium-ion batteries that typically maintain good performance for around 500 full charge cycles. After that, battery capacity gradually decreases.

How to Check Battery Health on Your iPhone

Checking your battery health only takes a few seconds.

1. Open Settings.
2. Tap Battery.
3. Select Battery Health & Charging.
4. Check your Maximum Capacity percentage.

What Does Maximum Capacity Mean?

• 100%–90%: Excellent condition.
• 89%–85%: Normal wear with good performance.
• 84%–80%: Battery life may noticeably decrease.
• Below 80%: Apple recommends replacing the battery.

If you also see a message saying your battery requires service, it's a good idea to have it replaced.

Signs You Need a New Battery

Your battery may need replacing if you notice:

Battery drains very quickly. Phone turns off even with battery remaining. Device becomes hot during normal use. Charging takes much longer than before. Performance feels slower. Battery health is below 80%.

Tips to Extend Battery Life

You can help your battery last longer by:

Avoiding extreme heat. Using genuine or high-quality chargers. Enabling Optimised Battery Charging. Keeping iOS updated. Avoiding leaving your phone at 0% or 100% for long periods. Removing thick cases while fast charging if your phone gets too warm.

Is Battery Replacement Worth It?

For most users, absolutely.

Replacing the battery is significantly cheaper than buying a new iPhone and can make your device feel much faster. A fresh battery restores longer battery life and helps your iPhone perform at its best.

Professional Battery Replacement at Star Phones

At Star Phones, we provide fast, affordable battery replacement services for most iPhone models. Our experienced technicians carefully replace your battery using quality replacement parts, allowing you to get back to using your phone with confidence.

Whether your battery drains too quickly or your phone no longer lasts through the day, we're here to help.