alt Hacker NewsIt might be just-about acceptable for a smartwatch. But anything the micro takes out of the power budget means less screen and radio time, which does add constraints.
PineTime, based on NRF52, will get you 4-7 days of practical usage.
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aa-jv • last Wednesday at 10:51 AM
Can confirm, I regularly get about 9 days of charge on my PineTime, running the latest PineTimeOS release. Its gotten better and better over the years, and the functionality keeps coming ..
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There are ESP32 watches. One I have[1] comes with quite thick 940mAh battery but my understanding is the battery life still isn't that amazing (just got it, haven't really tested the battery) - something like less than a day of constant runtime or few days if you turn it off constantly
[1] https://lilygo.cc/products/t-watch-s3-plus