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HealthyPi Move: An Upcoming Open-Source Smartwatch
(linuxgizmos.com)
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Every device with extra swappable batteries that I've used has a charging station that you can just keep the extra battery in. Not really anything to "manage", it just effectively removes charging time from the equation.
These watches typically come with charging cables, not a docking style station that you put them in. And keeping devices at a perpetual full charge for expended periods of time is a surefire way to kill the capacity quickly.