My history: * 5 nights ago (Monday night in US), went to sleep w/ 84%, woke up w/ watch dead (off and won't start). * 4 nights ago (Tuesday night in US), fully charged before bed, went from 100% to 17% overnight. * Live Chat w/ Customer Service; they had me do reset. * 3 nights ago (Wednesday night in US), battery drained overnight. * 2 nights ago, put it on the charger before bed and forgot to wear it bed. On the charger in the morning it was at 100%. * Yesterday: AN UPDATE WAS PUSHED TO MY SAMSUNG GALAXY PHONE, AND I INSTALLED IT. * Last night, I fully charged watch before bed, put it on, and this morning it is at 94%.   So, I conclude that either: (a) the bug doesn't work on Friday nights; or, (b) the update to my phone  altered the universe. ... View more

Yesterday I posted that I was having the same problem for two days. Through Live Chat with Samsung, they had me do factory reset. Last night I fully charged the battery to 100% before bed. This morning I awoke and the battery was at 18%.   This morning on Live Chat, they said I could send it in to them.  I declined to send it in. They moved me to Phone Support, giving me a new ticket number. I've not called Phone Support. Maybe later today. I say maybe, because it sounds like the only solution they'll suggest if for me to send the watch to them, and I'm not really inclined to do that. ... View more

I had the same issue, battery drained the last two nights.   I went to Samsung account online, and used Live Chat. They had me do a factory reset.    Now, I'll wait to see if it does the trick tonight. ... View more