Should be a easy fix these days. Power meter's use strain guages. These are resistive based devices. Resistance changes with temp. Might also be a slight contraction or expansion on the actual crank material. But if you know the temp (measurement) and material properties you can factor it in and adjust accordingly.
There is still the 2022 model listed on their global site: " https://www.merida-bikes.com/en/bike/3081/reacto-9000 " doubt their will be any major changes to 2023 model
At least with the NGECO one can replace the batteries. Unfortunately it appears as if much like XCADEY the SIGEYI has a internal sealed battery. Once it is depleted you might as well throw it away. But still good value for money !
I was in the same predicament a while ago. Managed to find a engineering workshop close by that had the right size. After seeing there tap collection I doubt there is actually any size and pitch they couldn't cater for.
The yellowish colour tubless specific tape. Unfortunately comes on big rolls around R400 but at least it lasts a while. It's far better than duct tape for both mtb and road.
