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iPhone 17 Pro Max battery health at 99% after 132 cycles, faster drain

What is the reason for the battery to go down?

Subject: Request for Investigation into

Battery Health Degradation and Faster Battery Drain — iPhone 17 Pro Max Dear Apple Support Team, I am contacting you regarding my iPhone 17 Pro Max, which I purchased brand new in its original box during Ramadan 2026. My device is still within Apple’s one-year limited warranty. I am concerned about the decrease in my battery health from 100% to 99% after only 132 charge cycles, as well as the fact that my battery now drains faster than it did previously. I would like to explain the circumstances surrounding my device in detail so that you can better understand my concern. 1. Purchase and device condition I purchased my iPhone brand new in its original box. Since purchasing it, I have used it very lightly and have taken great care of the device and its battery. 2. Charging habits I consistently use an original Apple charger and cable. I usually recharge my phone when the battery reaches approximately 24%, 25%, or 30%, and disconnect it whe Up to shipping 80, 78 or 75


And I use according to the terms and standards of use from Apple

2 replies

This is a user to user forum, Apple is not here.


There is nothing to investigate, batteries degrade over time with usage due to chemical aging.

You can expect about a 1% drop per 50 charging cycles (25 charging cycles for IPhone 14 and older) with average use on an iPhone, so you are actually way ahead of the expected health.

This is an approximation, that is why it may be plus or minus a few percent on a month to month basis.

Apple recommends replacing the battery when it's health reaches 80%.


iPhone Battery Replacement.

Apple Service and Repair for iPhone Battery - Apple Support


About Lithium Ion Batteries

iPhone battery and performance - Apple Support (IN)

You should really be happy about your Battery Health. At 132 Cycle Charges, it would be more normal for the health be in 97% - 98% range, but your battery is at 99%.


On average, for about every 50 cycle charges, your battery health may go down about 1%. Your battery is doing better than expected. This will explain it in more detail --> Battery Health Decline - Should You Worry… - Apple Community