You gotta give it more than 45~ minutes. Its way more complex than that. If you use a battery health monitor app that measures the mAh of the battery, you will see that its not as simple as looking at the iOS battery % indicator.Battery life is still trash 98% to 92% in 10 minutes
The iOS battery % doesn't start to drain until the battery is really at 95%. Its not linear. The first 5% of the actual battery maintains 100% on the iOS indicator and then goes down from there. When iOS says 50%, the battery is really at 47.5% and at 0%, well they are both at 0%. The iOS indicator has only ever been an estimate.
Also, you just updated. The phone is doing background work.
My 6S Plus has stellar battery life on 9.3.1. Mine is Samsung chip. Lasts 2 days easily.
Those complaining of poor battery life are TSMC probably.
9.3.2 beta contains so little that I won't be installing and sacrificing my battery life of 9.3.1.
Its funny you mention that. I have a TSMC 6s and my GF has a Samsung. She has not had any battery problems on 9.3 Final and 9.3.1. But I've had nothing but problems since I updated to 9.3F from Beta.