My battery appears to be all jacked up. Yesterday it died after around 12 hours with a black AOD watchface. Not great, but ok. I plop it on the charger, and maybe fifteen minutes later I turned it back on because I use it to keep my phone unlocked. Well, after just 15 minutes, it showed the battery at 76%. Then after maybe 10 minutes, it was down to 52%.
Just ordered a battery from Amazon to see if I can get a little more life out of this thing. 2.5 years of every day use is a decent lifetime for a battery, at least using phones as a reference.