I have a ipad mini 4 but hey siri only works when it is plugged in how do i fix that

adean1717 wrote:

I have a ipad mini 4 but hey siri only works when it is plugged in how do i fix that

There is no fix, that is how it work for your model ipad, if you want that feature you will need to upgrade your ipad.

See here Devices that support "Hey Siri" - Apple Support

This is the normal, expected behaviour for your model iPad.