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FR945 battery problem

Hi, I have a problem where the battery drains out way too fast on my watch. I got this watch brand new less than a month ago. 

Yesterday I charged it up to 100 % at the middle of the day. It got down to around 90 % before I went to bed and 75 % when I woke up. After a 90 min run today I'm down to 50 %. 

What may cause this problem? 

I have updated to the latest software available. I'm using 24/7 HR and smart notifications, but does that really drain the watch that much? I'm also using the Enduro watch face. Pulse ox. is off. 

I would really hate it if I have to do a hard reset, as I've spent hours configuring all the different activity profiles etc.