Solved: Photos App Background Battery Drain on iPhone 16 Pro Max (iOS 18.x)

After updating to iOS 18, I noticed the Photos app was running over 20 hours per day in the background, seriously draining my iPhone 16 Pro Max battery.

Over six months, I worked closely with Apple Support (including senior advisors and an engineering escalation).

I tried:

Resetting the phone multiple times

Changing iCloud settings

Reinstalling the photo library

Swapping devices trying a brand new iPhone .

Charging from different power sources

Leaving the phone in StandBy mode

I spent over 24 hours on the phone with Apple Support during this time, and tried over 50 combinations of settings, including iCloud toggles, charging modes, low-voltage and high-voltage charging, StandBy configurations, and various photo library management strategies.

None of them solved it — until I tried the following approach.

What Finally Fixed It:

Here’s what I did immediately before the background drain stopped:

Deleted all photos from my iPhone completely.

Left the full-resolution versions safely stored in iCloud (and also on my iPad).

Then, I re-downloaded the photo library from iCloud to the iPhone.Kept the iPhone completely photo-free for 7 full days — no images at all.

Shortly after this, the Photos app stopped running in the background for extended periods. Battery usage now shows only a few minutes per day — which is completely normal.

Final Thoughts:

I can’t explain why this worked — but it’s the only time in seven months that the battery drain issue finally stopped. Maybe a stuck indexing queue cleared. Maybe something changed behind the scenes in iOS. I never got a definitive answer from Apple, despite all the effort.

But I’m sharing this in case it helps someone else avoid the same frustration.

Good luck.

[Edited by Moderator]