iOS 15.1 Battery Drain on iPhone 13 Pro Max

Absolutely is a Safari running on iOS 15.1 issue - In fact I'm noticing larger than normal battery usage on most of the iPhone Apple apps but Safari is by far the worst offender. It's basically halved my battery life. I was on chat with Apple support yesterday and they aren't acknowledging this as an issue. They basically said I need to change my settings i.e. dim my brightness (which I usually have at 20% anyway!), switch off background app refresh, clear cache daily on Safari and turn my phone off and on again. I'll be escalating with L2 support later today and if they don't acknowledge as an issue I will consider asking for a full refund on my phone. If I'm not able to use it the way it's been advertised that I can use it with a battery life commensurate with that usage, then it's a device no longer fit for purpose.

Im using new Iphone 13 pro about 1 weeks with verson 15.1.1 . I noticed battery drain issue too. About 1 hour stanby, drain around 3-6%. During sleep and woke up in the morning, battery drop around 12%.

Siri - disabled

Dark mode - enabled

Background refresh - Only allow whatsapp

Connected to Wifi

I dont think its configuration issue but more to OS level itself.

Its not my expectation for the battery drain so much just on standby mode.

I had the same issue, switched to Chrome from Safari et voila, battery lifetime increases. I need to evaluate battery lifetime the next days.

Iphone 13 Pro, IOS 15.2