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What’s your battery health? It can’t be good if you charge it for over 12 hours on a regular basis.
Since the new update my Apple Watch S4 just jumps in charge level… it goes from 70-80% to 10%…
Yup. supposedly Watch OS 10.1.2 is a fix. We shall see.
What series is your watch? Cellular or GPS?
The Apple Watch runs watchOS.
Battery maybe worst off than you thought