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Why don't smart watches use USB-C to recharge?
(shkspr.mobi)
This is a most excellent place for technology news and articles.
I also had all the Pebble, and technology has come a long way since.
The incoming Pebble revival uses the nRF52840 chip, which they estimate the battery life to around 30 days, from the usual 7 days.
I settled on something a bit more classic, I bought a Casio GBD-200 which has bluetooth connectivity, can display basic notifications and do some step counting. It works on a CR2032 battery that lasts about 2 years, no recharge needed.