[room505]

I wonder if an eink display would work okay. Then it would last a month!

[Melatonic]

Or one of those new screens (MIP I think?) that may end up being what eink always wanted to be but with better refresh

[bobthedino]

Yes, in fact Casio uses MIP displays in some of its recent watches, e.g. this Bluetooth connected watch has a 2 year battery life: https://www.casio.com/intl/watches/gshock/product.GBD-200-1/

[Melatonic]

Yea exactly. I was about to buy a new Pro Trek but given that I like negative displays I was considering waiting in case they switch to MIP.....although I was looking at the mainly analog models where the little screen matters less.

[iszomer]

The GBDH1000 is worth looking into as well, packing not only the MIP display but a suite of sensors as well as being powered by a solar element.

[chem83]

MIP as in memory-in-pixel? Like the Sharp memory displays/LCD used on the Panic Playdate, for example? https://www.adafruit.com/product/4694