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Wasn't there a version with self winding but no surplus return to battery. It had no health sensors though as a extrem low energy device.

If I recall correctly the winding energy was directly used up for operations to spare the battery. Someone help me out, the core was some SOC from TI..

[keymon-o]

Sequent Supercharger smartwatch series perhaps?

I actually never heard about it but I guess we now live in the era of “gpt is your friend”. :)