There is no autonomy, not always enough even for one day. In the morning, between sleep and going to work, I didn’t charge - upon returning home, they had already sat down. If you turn on the power saving mode, they will last longer, but not all functions will work.
As for NFC, at one time there was a life hack to install the Mir Pay application on the watch, but it was in May, and in September it didn’t work out for me to make friends with the Mir application: the application crashes. We shouldSee full review