iPhone pro max 14 battery doesn't efficient as iPhone promise 29 hrs playbackc.

Hello Sir/Madam,

I bought an iPhone pro max 14 on 26/09/2022 and only used it for a week but I am very disappointed with the battery life of the phone.

My phone battery lasts only for 15 to 19 hours on 100% charge.

I bought this phone because the iPhone website shows 29 hours of video playback.

I don’t know why but my 14 pro max doesn’t last that long.

I would like to know why my pro max battery is not good enough or there is any problem in my phone?

Thank you.

Best Regards,