Suggest a good smartwatch for hiking

Can someone suggest a good smartwatch with a real good battery life? I have an amazfit trex 2 watch and it's strap broke. I am unable to find a replacement strap. I tried a strap from amazon that came with a screwdriver but I was unable to unscrew and fix it. None of the local watch repairers are able to fix it. So, I am looking for a watch that is not amazfit. If nothing else is good, I could go for trex 3 or falcon. I plan to use the watch for trekking especially high altitude treks in himalayas.