Battery Health Decline - Should You Worry and What to Expect

Battery Health Decline – Should You Worry and What to Expect:

Multiple times a day, we see people who are concerned their battery is now showing Battery Health Decline and they wonder if it’s normal or should they should be concerned.  First, to be clear, batteries are chemical consumable parts, which with every full cycle charge, will lose  some health.  We get a shiny new iPhone, which shows no cycle charges and a Battery Health of 100%.  Great!  But then over time, as we charge our phones, eventually, the battery health starts to decline and that’s when the worrying starts.

Since batteries are chemical devices, no two batteries will decline in the exact same manner.  We often hear…….”but my friend’s phone hasn’t declined.”  And that may be true, because just like no two batteries will decline in the exact same manner, no two people will use their phones in the exact same manner either.

What’s Normal?

Let’s look at the current iPhone 17 Pro Max iPhone for example.  The unit of measure of a battery’s electrical charge capacity is called mAh, which stands for milliampere-hour.  The stated mAh, for an iPhone 17 Pro is listed as 4,252 mAh.  Again, this is approximate and while the iPhone 17 Pro battery will come with this storage capacity, it can actually come with more than 4.252 mAh.  Since Battery Health doesn’t show a number higher than 100%, its capacity could actually be 102 (for example) it logically takes more time for a battery with a higher capacity to dip below 100%. This is often when people become concerned and we see multiple posts a day, asking if the decline they are now seeing is normal. Also, Battery Health is only shown in whole numbers.  This means when Battery Health is displayed as 97%, it might actually be 97.9%, but is only shown as 97%.

What You Can Expect?

First, let’s be as clear as possible.  There is NO WAY to stop Battery Health Decline.  NONE.  ZIP.  Nada.  Battery Health decline is not linear. It can remain steady for some time, then drop a few points rapidly.  This is not something to be concerned about and is the normal and expected behavior of Lithium-Ion batteries. Every time you charge your phone, which is calculated when an iPhone is charged from 0% to 100% = one cycle charge, your battery will lose a little of its health.  Said differently, when you charge your iPhone twice from 50% to 100% = one cycle charge.  Charge it from 80% to 100% five times = one full cycle charge. Apple says the batteries in iPhone 15 models and newer should retain up to 80% Battery Health over 1,000 full cycle charges. This translates to about (again on average) to a 1% drop in Battery Health for about every 50 full cycle charges. For iPhone 14 and older, the battery was expected to dip to 80% after about 500 cycle charges.  Your iPhone will also let you know in Settings when the battery dips to 80% or below with a notification that Battery Service is Required. 

A Simple Way To Determine if Battery Health is Normal on Your iPhone:

• Open the Settings App > Tap Battery > Tap Battery Health
• See the number of Cycle Charges and divide by 50
• If Cycles is, for example, 200. 200/50 = 4.
• 100 - 4 = 96
• If after 200 Cycles, your Battery Health is 96% (or better) - Your Battery is performing to normal expectation.

Note: Apple iPhone Warranty in most parts of the world, says if Battery Health dips below 80% in the first 12 months of ownership, they will replace it under warranty at no cost. This assumes you bought the phone directly from Apple or an Apple Authorized Seller where the warranty started the day you bought the phone. If you bought a phone from a gray market seller, the warranty may well have started well before you purchased the phone. If you wisely invested in an AppleCare+ Plan, battery replacements, when required are free as long as the phone is still covered under AppleCare+.

How Can You Help Your Battery Stay Healthy?

1. Read this thoughtful article from Lawrence Finch about when to charge your iPhone -->  When to charge your iPhone or iPad - Apple Community
2. Read this Apple Support Article about maximizing battery performance -->  Batteries - Maximizing Performance - Apple
3. Read this Apple Support Article about battery performance as it relates to your iPhone -->  iPhone battery and performance - Apple Support

Conclusion:

Stop Worrying about the natural, normal and completely expected decline in Battery Health.  You can’t stop it.  So, worrying about it is a waste of emotion.  When the health of your battery dips to 80% or lower, which it absolutely will if you own your phone long enough, that’s when you schedule an appointment at your Apple Store Genius Bar or an Apple Authorized Service Provider to replace the battery and the Battery Health clock starts all over.  This link will tell you how to schedule an appointment and current costs --> Apple Service and Repair for iPhone Battery - Apple Support