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If none come up in the search that are model-specific and contain the battery size, proceed to the next step. Remove the back of the watch to look at the numbers on the battery directly. You may need a knife to wedge the back off, since the gap between the watch back and the rest of the body is usually very slender. A screwdriver will almost never be narrow enough to fit into the gap.
Apple Watch is supposed to have 18 hours of battery life, which would translate into a full day if I were to ever keep to a normal sleeping schedule. I was able to lengthen the uptime of my watch to a full 24 hours on days in which I didn't make battery-taxing phone calls with it, or use the half-as-power-hungry heart rate monitor.