Battery Life on iPhone 6s Plus Normal?

[6thDAY]

Hi guys, I wanted to ask your opinions before I take make a Genius Bar appointment.

I got my 128GB 6s Plus on Friday and noticed it was draining battery substantially fast on idle. So I did 2 tests.

1st test:
Charged it to 100%+ (left it for some time after 100%), turned ON Airplane Mode, unplugged it, timed it, left it idle, and after 8 hrs the battery it was still at 100%.

2d test:
Charged it to 100%+ (left it for some time after 100%), turned OFF Airplane Mode, unplugged it, timed it, left it idle, and after 8 hrs the battery it went down to 78%. Therefore, it's dropping at a rate of 2.75%/hr.
The Settings enabled were:

1. WiFi: ON
2. Bluetooth: OFF
3. Auto-brightness: ON
   
4. Cellular Data: ON
5. Background App Refresh: OFF
   
6. Personal Hotspot: OFF
7. Reduce Parallax Motion: OFF
8. Low Power Mode: OFF
9. Siri: ON
   1. Allow Hey Siri: ON
10. Location Services: ON
    1. Call Network Search: ON
    2. Find My iPhone: ON
    3. Setting Time Zone: ON
    4. Wi-Fi Networking: ON
    5. Everything Else: OFF
11. iCloud: ON
12. Mail -> Fetch New Data: OFF
13. Apple Music: OFF
14. Airdrop: OFF

I have no background apps running. That would mean at this rate, in 36 hrs, the phone would die just from idling.

I don't think that's normal, even with the mentioned settings being on. The phone is running on iOS 9.0.1.

Let me know what you guys think?

Thanks.