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I got a series 0 (not series 1 as in the thread title) Apple Watch Sport this time last year.

Yesterday morning, I took it off the charger at 100% and later that day it turned itself off for no apparent reason and would not turn back on. When I connected it to the charger and it got power, it showed the battery at 77%.

I put it on charge overnight and this morning I took it off again at 9am at 100%. I noticed that it stayed at 100% for hours and hours before seemingly dropping normally. Just now, at 21:45, it has died. I put it on the charger and it's charging right now but I guarantee you the battery was nowhere near being even remotely depleted. I'll report back when it's got enough charge to turn on.

I only noticed it had turned itself off when my iPhone made the SMS incoming noise about ten minutes ago, which it obviously doesn't do when the watch is on my wrist.

Apart from a reset, which i'm going to try in a minute, does anyone have any ideas, or can shed any light on how I might fix this please?