I have had my vivomove style for right around two years now, and I have been wearing it constantly since, except underwater. The battery life has always been great, I would charge it once or twice a week, and it would run for the entire week, but lately, it would only last a day, a day and a half at most! Any ideas on what I could do to fix it? Or is there a place I could change the battery? I really love my watch and don't want to upgrade it anytime soon.