I always wonder how everyone gets 2-3 days of battery. I bought my sport model 5 months ago, and I charge my watch overnight and usually take it off the charger around 7:30am. I generally work out for 35-40 mins a day and the only alerts I have turned on are texts, FB messenger, Instagram. My watch is usually around 20% or less by 10pm. I have unpaired and re-paired and its always been the same. Im running 2.2.2 currently and it is the same as previous iOS builds. There is just no way I would ever get more than one day out of it.