iPhone Battery Health dropping rapidly

Batteries, like people are individuals. No two people age exactly the same and batteries don’t age the same either. The exact usage, chemical makeup, storage conditions, exposure to heat and cold and about a dozen other factors mean that every battery ages differently. Battery aging is not a linear (straight line) and degrades at different rates as the chemicals in the battery age and other factors mentioned above. Apple expects your battery health to be at 80% after 24 months. If your battery health misses that expectation, contact Apple Support.

Please review the Apple Support articles on battery optimization. It contains the best  current practices for battery charging.

iPhone Battery and Performance - Apple Support

Batteries - Maximizing Performance - Apple

About the battery and performance of iPhone 11 and later - Apple Support

All rechargeable batteries are consumable components that become less effective as they chemically age.

Recent software updates can accelerate that process by adding features that consume more power.

As lithium-ion batteries chemically age, the amount of charge they can hold diminishes, resulting in shorter amounts of time before a device needs to be recharged.

Apple won’t replace the battery until it reaches 80% capacity.

Li Ion (Lithium Ion) batteries have recharging capabilities; however there are limits.

I recommend to slow charge your iPhone to maximize the charge capacity, battery health and efficiency. ⚡️🔋

NOTE:

Capacity loss in standby applications is largely determined by temperature.

Charge above -30°C and discharge below 55°C for best results.

Battery Performance Tips:

• iPhone Battery and Performance.
• Check battery health and usage.
• Optimized Battery Charging.
• Maximizing Battery Life.
• Use Low Power Mode.
• About battery usage.
• Show battery percentage.

Click ▶︎ iPhone User Guide. 📖

Good luck! 👋🏼😉

Hi there,

Is there any overall change in battery usage? It may be wise to monitor the battery health for a few more days. If this trend continues, I'd suggest you make a Genius Bar reservation to diagnose the issue:

Genius Bar Reservation and Apple Support Options - Apple

Alternatively:

iPhone Battery Replacement - Official Apple Support

Check out this tip written by Lawence Finch : When to charge your iPhone or iPad - Apple Community

Even rechargeable batteries get worn down and 1-2% health loss per month is perfectly normal. Referring to the "Your battery's maximum capacity" section of the support article: iPhone battery and performance - Apple Support - "A normal battery is designed to retain up to 80% of its original capacity at 500 complete charge cycles when operating under normal conditions." Apple apparently only considers it unusual (and covered by warranty) if a battery drops below 80% maximum capacity in less than a year after you receive it. Ergo, some storage loss as you use it is anticipated and acceptable. A possible 20% drop over the first 12 months equates to 1-2% drop per month being within the range of what Apple finds acceptable. "The one-year warranty includes service coverage for a defective battery. If it is out of warranty, Apple offers battery service for a charge." In other words, if maximum capacity is below 80%, the battery is below normal performance and worth replacing. A notification will appear about this. You can still use a device with a lower health percentage than 80% but for optimal usage you may wish to consider having it changed when it reaches 80% battery health.

What this basically means:

- If battery health drops a few percentage per month that is normal.

- If battery health drops below 80% before the end of the first year, contact Apple about a warranty replacement. (Apple will test it to determine its actual eligibility.)

- If battery health drops below 80% (you will see a warning message) after the first year, consider getting the battery replaced but anticipate paying for it.

A trip to an Apple Retail Store would be a wasted trip. The iPhone evens says >Normal< and it doesn’t get much clearer than that. 😀

On average, the iPhone 15 battery will decline at about 1% for every 40-50 charge cycles. So, it would be normal to expect that your battery health would be at about 93-95% at this time.

But, the decline is not linear. Some months, the battery might not decline at all and then it might decline 2% the next month, etc.

Everything on your battery looks very normal at this time, so there is no need to be checking the battery all the time. The battery will do what it will do.

As I explained above, the decline is not linear. My battery went for almost 3 months with no drop and then it dropped 3% during the next few days.

It will be a wasted trip if you want to take the phone in to an Apple Store to have the battery tested, but you could do that if you want.

All that you really need to remember is to replace the battery when the health is down to 80%. Otherwise, you will drive yourself crazy if you are checking the battery all the time.

Did you even bother to read what anyone wrote? All batteries age differently. You’ll drive yourself crazy worrying about a change over a short period of time like a day or two. Why?

Lithium ion batteries have a life of about 5 years from date of manufacture if charged properly.

So 5 years at 365 days a year would be about 1800 days. Two days is just .1% (1/10 of 1%) of your batteries life. You’ve a long way to go and you’re going to worry yourself to death over nothing.

It doesn’t seem normal.

Be advised that temperature can affect capacity loss.