Hi, @LeonSports, welcome, battery drain depends on how you are using your "Sense" and the charge you give it. Why isn't my Fitbit device's battery charging? addresses charging issues. Some functions drain the battery quite a lot, the section on noise and snoring in How do I track my sleep with my Fitbit device? tells us about sound detection. In particular that you need at least a 40% battery charge before going to bed.
I used it a couple of times but turned it off.
FYG I'm swimming 90 minutes a day plus a 45 minute GPS tracked walk and using about 30% of the battery capacity each day.
I hope this helps.
Cheers
Gr4ndp4 | UK
AWAKE! for morning in the bowl of light has cast the stone that set the stars to flight.
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