Introduction
If the battery on the watch is working but you are struggling to turn on the watch via the power button then it might be time to replace the power button. You will need tweezers, jaxa wrench, and and iFixit opening tool.
Tools
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Using your fingers, press down on the rubber circles to unbuckle the strap from itself.
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Once you have removed two of the rubber circles from from a side you will be able to unbuckle the strap on that side.
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To access the battery compartment use the Jaxa-style wrench tool. Secure the midframe while you pop up the back.
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Conclusion
To reassemble your device, follow these instructions in reverse order.