Question about OPPO Watch

In economy mode and when you practically don't need it, 3 days. Normally 1-1.5 days. The 21 days are only marketing and do not correspond to reality. The Oppo Watch charges in no time. Within a few minutes you reach 50%+ and in 30-40 minutes it is fully charged.

1 day , if all functions are switched on.

1..2 day max. In super economy mode maybe a little more but not 21 😅

No, you can forget that right now.