How do I find my serial number
How do I find my serial number and why is my battery going down so quickly
iPhone 6s, iOS 14
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Read this article:--> Find the serial number or IMEI on your iPhone, iPad, or iPod touch - Apple Support
As for the battery is concerned, check your battery health in Settings>Battery>Battery Health ... tap there and discover your maximum capacity percentage. If it's below 85, make an appointment for battery replacement at an Apple Store or AASP.
Regards
Giulio