No pic necessary, the free battery deal has been going for a month+, and goes til the end of October. Plenty of other posts on it already (Fuel Grinder, Sawzall, HTIW, drill/impact combo kit all are part of the promo).
If you look at the value he gave the battery ($80) that is definitely not the full price. He pro-rated it based off the $129 price the battery has been most of it's time on shelves. The only thing I can't confirm, is if the value of the battery has changed in store. If it is ringing $100 now, you will get closer ~$68 back for the 5.0.
Saying it's not a full value return is redundant if you just prior said it was pro-rated.