Recently received garmin replacement has poor battery life

My watch I owned for 2yrs had issues with GPS connectivity and I had contacted support team, who agreed to issue a replacement watch. I received my garmin replacement watch 245 music recertified on Oct 21 around 5PM UK time. Since then I’ve already had to charge this watch 2 times with no activities recorded. On Oct 22 I charged this watch at 4PM to full 100% and now when I write this post (4:30AM UK), it has just 11% charge left. I’ve turned off pulse Ox, removed notifications and backlight is set to 8s turn off. Except for wrist HR nothing else is turned on. The settings on this new watch is same the ones I had on my old watch and yet the battery life is really poor. My previous watch lasted me good 5+days with activity recording.

I have no clue what am I doing wrong with the new watch :(