New battery test, en route to @crowdsupply #teardown at day 850: 2.52 volts. I missed the check-in at day 800 (2.72 V) but the trend line is clear: it’s going down. Probably 8% of charge left. I’m guessing I’ve got another 74 days on this coin cell, which puts it dying in early September. With some luck — and a lot more hard work — I might just have Sensor Watch Pro ready by then. 🤞🏽