When Home Depot does the free gift promo they split the $ 249 on the receipt between the two items.
An example
Impact wrench kit $ 155.78 + 6.0 AH Batteries (2 pack) $ 93.22= $ 249. If you decide you don’t want to keep one item or choose not to pickup up you can still keep the other at discounted price.
Free Gift Options
18V 6.0 Ah MAX Output Lithium-Ion Batteries (2-Pack)