iPhone 6s battery at Maximum Capacity and battery still draining
I have an iPhone 6s with a 6 month old battery that is showing Maximum Capacity health. I've cleaned up phone, deleted old apps, turned off location services, turned off background app refresh, and even reset the phone and the battery still drains really quickly -- from 100% to 60% within 20 minutes.
I updated to 13.6 just the other day and it had no change.
Any advice??
iPhone 6s, iOS 13