battery life

I've had the Garmin Edge 840 for a few days (Firmware versions 24.56) 
I saw a battery drain of 10% every hour. Garmin claims a battery life of around 26 hours,
with the following settings / use:
gps setting MULTI GNSS MULTIBAND
sensors 4
phone connected YES
live track enabled YES
backlight Brightness AUTO
backlight timeout STAY ON
notifications receveided per hour 8
use intefave interactions per hour 15
user interface configuration MAP PAGE
following a course YES
operation temperature range 10-40
n my case I used 3 sensors, no notification received, I didn't follow the map. Therefore less use than declared by GARMIN. The only difference is the temperature of around 7 degrees.

Is it possible that I have such a high consumption?