The Item Batch Number is specific to the item that you are requesting parts for.
You can only request parts for one specific item at a time.
There are several locations where you can locate the Item Batch Number
You can find batch code on the back or bottom of any KidKraft product.
You can find batch code on the outside of the box.
You can find batch code in the back of the assembly sheet.
If you enter a batch code other than the batch code displayed on your item the replacement parts you receive will not be compatible with the item in your possession. This is extremely important as there are no returns or refunds on parts purchases.