You can give agent level users the ability to use batch check-in/out feature under the Permissions tab. Select the custom policy that you would like to update or copy an existing policy. Next, go to the Asset section. Here, the Edit and Assign Owner column needs to be checked for this feature to be available to the users. You have the ability to apply it to all location or individual locations. Scroll to the bottom and click Save.
Please note, the batch check-in/out is not supported for Requestor level users at this time.
Note: Need to know how to use batch check-in and check-out features go here.