Hi!
I'm having the same issue. My battery life will only last me maybe a day tops. I have to constantly be charging it and it's hard to now track my sleep as I have to make sure my fitbit is fully charged before going to bed if not it'll die and I cannot use the full benefits of the sleep tracker. This morning at about 9am I was at 43% and by 2 pm it was dead and I didn't even notice. If anyone from fitbit can reach out as my Sense won't last me a whole day's worth of battery without it needing to be charged.