A Report Batch is a group of Forms. The batch must be of forms to be filed with a single agency.  (Can't mix W-2s and 1099s)
The following are examples of a Report Batch.

 

Company A 1099-Misc, Company A 1099-Int, Company B, 1098-C.

 

or

 

Company A 1099-Misc, Company B 1099-Misc, Company C 1099-Misc,

 

or

 

Company A W-2s, Company C W-2s