Hi!
I had the original Vivoactive before and it had amazing battery life with bluetooth always on. Battery lasted from 10 to 20 days depending on use and it still is holding strong after more than 5 years of use!
I upgraded to Vivoactive 3 and battery life compared to original sucks. I am getting 3-5 days no matter what I do. I tried to disable HR, bluetooth, turn backlight intensity and duration to min and turn off every sensor I could and I still can't get more than 6 days of battery life. I even turned off the watch and let it off my had for a week and today I found the battery empty!
I am still happy with the watch but I was happier with the first vivoactive so I consider selling the newer watch and keep using its predecessor.
I was expecting the newer watch to have bigger battery capacity and be more efficient with energy usage, at least when additional features are turn off, and I find it strange that it is not.
I would love to hear your opinion on the matter