Displaying battery percentage on the status bar helps you easily control your battery usage.
Display battery percentage on Vivo V7 following the instructions below:
Step 1: Go to 'Settings' and select 'Status bar and notification bar.'

Select 'Status bar and notification bar'.
Step 2: Turn on 'Display battery percentage'.

Turn on 'Display battery percentage'.
That completes your setup process. Wishing you all success.