https://hackaday.com/2017/02/15/chronio-diy-watch-slick-and-low-power/
Chronio DIY Watch: Slick And Low Power | Hackaday
Feb 15, 2017 - [Max K] has been testing the battery life of his self-designed watch under real-world conditions. Six months later, the nominally 3 V, 160 mAh CR2025 cell is...
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