My daughter loves her Fitbit and suggested I would too. So I picked one up at the PX. Didn’t realize they came in sizes and I inadvertently grabbed a small. Which just barely fit around my wrist. So I exchanged it the next day for the large size which is much more comfortable. Then the battery gave out half-way through my walk and I was “fit” to be tied. Gave it a full charging overnight and today it carried me through my entire walk. Actually, the battery is supposed to be good for 5 days of “normal” use. Hope so. It’s still showing “fully charged” so far.