iPhone 16 Pro Max drains fast ~9.5 h use?

Hi everyone,

I’ve observed over an extended period—not just a single day—that my iPhone 16 Pro Max delivers much less battery life than expected. On average I get only 8–10 hours of use, for example:

• Screen on: 8 -10h (light use: Facebook, TikTok, Spotify, 15 min of calls, app setup)
• Screen off: 1 h 10 – 2 h 10 min of background activity
• Battery remaining: 16 % at 23:17 after a full charge at 07:51 → about 9.2 h total runtime
• Efficiency: 0.11 h (6.6 min) per 1 % battery = only 29 % of Apple’s specified 0.33 h/1 % (video playback)
• Expected: Up to 33 h video｜29 h streaming｜105 h audio

Tried without effect:

• Set up as a new phone (no backup)
• Latest iOS + Low Power Mode
• Disabled Background App Refresh, notifications & Location Services
• Original MagSafe & ≥20 W charger

Question: Has anyone else experienced similar battery drain on the 16 Pro Max? Could this be a software issue, calibration error, or something else?