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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.
@Jean-Philippe_Rey
As part of an old project, I had to drive an e-paper display [almost the same as yours] on a coin cell battery (CR2032). It was observed that for such a refresh time (each 5 minutes or less) , we got very good results (weeks of life-time) by just having bulk capacitors (low ESR) in parallel with the coin cell and by minimizing the decoupling capacitors dedicated to COG (chip on glass). The trade-off was a slightly longer refresh time (2 seconds instead of 1.0-1.5 seconds) but this was not a problem if the e-paper got refreshed each 3 minutes. This is due to the fact that each time you want to refresh the e-paper, you must first charge the decoupling capacitors of the COG, which can represent a great slice of the lost energy in the drive-circuit.