New iPhone 18 Pro Max experiencing severe battery drain

Severe Battery Drain on My New iPhone 18 Pro Max – Is This Normal?

Hello everyone,

I recently purchased a brand-new iPhone 18 Pro Max, and I’m experiencing unusually fast battery drain.

Here are the details:

* Device: iPhone 18 Pro Max

* iOS Version: iOS 27.2

* Battery usage: 100% to 50% in approximately 2–3 hours.

* Main app used: Facebook

* WhatsApp video calls: Battery drops by around 10% during a video call.

* Network: 4G (I currently don’t have Wi-Fi).

* Standby drain: No significant battery drain when the phone is idle.

* Background activity: Battery seems to drain quickly even during normal usage.

The phone is only 7 days old, and I have already tried basic troubleshooting.

I’m concerned because this is a brand-new flagship phone.

My questions:

1. Is this level of battery drain normal for the iPhone 18 Pro Max?

2. Could this be an iOS 27.2 software issue?

3. Should I perform a factory reset or contact Apple Support?

4. Could my device have a defective battery?

I’d really appreciate advice from anyone experiencing similar issues or anyone who has found a solution.

Thank you!

Posted on Nov 8, 2026 11:29 AM

1 reply

kaz-k

Level 9 (53,902 points)

Nov 8, 2026 11:39 AM in response to Niyam7

Hi,

Severe battery drain on a new Apple iPhone 18 Pro Max is often normal during the first few days as the device completes background setup, iCloud syncing, photo indexing, and system optimization.

Why It Happens

Initial Setup & Indexing: A brand-new phone or recent software update forces the processor to work overtime indexing files, downloading app data, and synchronizing photos in the background.
Display and Connectivity: High screen brightness, always-on features, or poor cellular/5G signal strength can rapidly deplete power.
Background Apps: Certain social media or utility apps continue running processes even with restricted settings.

How to Fix & Check It

Check Usage Stats: Go to Settings > Battery to view the daily usage chart and identify which apps or system services are consuming the most power.
Optimize Display: Lower your screen brightness, turn on auto-brightness, and shorten the auto-lock time via Apple Support guidelines.
Manage Background Activity: Review Settings > General > Background App Refresh and disable it for non-essential apps.
Restart the Phone: Perform a standard restart to clear out stuck background tasks.
Wait a Week: Give the device about 5 to 7 days for background indexing to settle. If the drain persists heavily after a week of light use, reach out to Apple Support to run a hardware and battery diagnostic.