A Batch can be renamed if it's open (not closed), and you have the Access Rights to make changes in the Offering Module.
1.) Go to "Batches" under the Offering Module and click the "Edit Batch" button next to the Batch you wish to change.
2.) Hit the "Edit" button.
3.) Change the Batch name and give a reason for auditing at the bottom of the window. Then hit "Save".
4.) Hit "Close" and you're done.