Hi everyone,
I recently bought the iPhone 16 Pro and, like many of you, faced some serious battery issues in the first few days. My screen time was barely lasting 7 hours, and the battery percentage was dropping faster than expected, even though I was following the 20-80% charging rule.

I decided to experiment, and here’s what I found:

What Happened Initially

• The battery drained quickly, even with minimal usage.
• It barely lasted through a day, and charging to 80% didn’t seem to help.
• This seemed unusual, given Apple’s claims about the iPhone 16 Pro's battery performance.

What I Did

1. Turned Off Battery Optimization:
   • I disabled "Optimized Battery Charging" (found under Settings > Battery > Battery Health & Charging) temporarily.
2. Charged to 100% Once:
   • I let the phone charge all the way to 100% and kept it plugged in for about 3 hours to ensure it was fully charged.
3. Let the Phone Settle:
   • I gave the phone a few days to complete any background processes like indexing.

What Happened Next

• Battery improvement: After charging to 100%, I noticed a big change. For example, I watched videos for an hour, and the battery percentage stayed at 100%.
• Longer battery life: Over the next few days, the phone’s performance improved significantly, and the battery lasted much longer.

My Thoughts

• Indexing: The initial battery drain was likely due to background tasks like indexing photos, apps, and files.
• Calibration: Charging to 100% without optimization might have helped the battery system recalibrate.