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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@allObjects
Don't know your space constraints, but 3 Alkaline (LRs - or simple 3 AAA) may be a better solution... you could even think of 3 (rechargeable) NiMHn s. If you really want to go for button cells, there are rechargeable CR2032 that deliver 3.6V - more than the regular which deliver only 3V - but they have a fraction - 20% - of the capacity: rechargeable CR2032. They give you 40mAH,... putting a few in parallel could be an option - feeding PICO on VBAT pin.
Espruino Power Consumption shows you what you need... if it is to just keep something going with very very very low duty cycle, you may get away with a single 40mAh cell... but be aware, that when Pico runs, it is draws very very very heavy on the cell... 10...100 times more the load as most shown discharge profiles even document the capacity for... which means that it may run, may be - it is a guess - 20 mins continuously... That's why now the newer, even more lower power chips are available and aree
used for BLE... may be you change to a BLE breakout (or pixl for that reason).