Thanks for the suggestion. I've already tried this and the Gear Wearable app doesn't appear in the Battery Saver menu. I already have it set to "no restriction".
It comes with a EU charger and a UK adapter So if you want something more streamlined buy the Ugreen charger that someone posted
I'm guessing this may be the aggressive battery management on Xiaomi handsets. Essentially the phone kills off any processes in the background unless you select the app in the battery management option and tell it not to. (Settings > Battery & Performance > Choose Apps > set to no restriction for your Gear app).
Has anyone ordered one of these? Does it come with a UK charger?
Gotta have that latest pop-up camera fad. We'll see on payday whether it's worth it :)