Apple Watch Power drain
My apple watch is draining its battery quickly within 4 hours of being fully charged.
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I suggest starting with a Forced Reset (reboot) to clear any corrupted apps running in memory. Press and hold both the Digital Crown and the Side Button (together) about 10-15 seconds, until the Apple logo appears. Then release the buttons and let your watch restart. Check battery drain again after the restart, and if the problem continues you should contact Apple Support to arrange a full check and service on the watch battery.