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A quick flick of a plastic opening tool is all it takes to dispatch the light adhesive securing the battery.

This wee 3.8 V, 0.78 Wh lithium-ion battery is the power behind the 38 mm Apple Watch. No gears here! Apple claims the 205 mAh battery should provide up to 18 hours of use (which translates to 6.5 hours of audio playback, 3 hours of talk time, or 72 hours of Power Reserve mode.)

According to Apple, the "battery performance claims are based on test results from the 38 mm Apple Watch. A 42 mm Apple Watch typically experiences longer battery life."

A 205 mAh battery seems miniscule in comparison to the 300 mAh batteries found in the Moto 360 and Samsung Gear Live. Hopefully, Apple's Watch OS will help the battery stand the test of time and avoid the problems that initially plagued the Moto 360.