Zte BLADE A512 User Manual page 132

Touch > Battery saver to manage battery saving mode. You
can turn on or off Battery saver, or set a battery level at which
Battery saver can turn on automatically.
Touch > Battery optimisation. Battery optimisation helps
prolong battery standby time when you're not using the phone.
If there are apps that you don't want battery optimisation
enabled, you can turn the feature off in those apps. Just touch
Not optimised > All apps, touch the app name and then touch
Don't optimise > DONE.
Memory
Touch >
memory use and performance of your phone. You can also
check which apps use the most memory.
Users
Touch >
accounts of your phone.
You can share your phone with other people by creating
additional user accounts. Each user with a separate account
has his/her own storage space, wallpaper, screen lock and so
on. Users can also adjust device settings like Wi-Fi that affect
everyone and update apps for all other users.
By default, a Guest account is available for anyone who needs
to use your phone temporarily. You can touch Add user to
create more user accounts.
> Settings > Memory to monitor the average
> Settings > Users to manage the user
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