Question for the Milwaukee gurus

I thought I was a guru but I don't know why this is a 2610-84 if it only includes two batteries:
http://www.reconditionedtools.com/f...ion-sale&prefn1=taxonomyAddress&prefv1=Drills

I fully understand the 80 prefix is recon but they still usually do 81 for 1 batt and 82 for 2 batts.

Anyone know?