I just got this email:
Woot here. We messed up and advertised your Milwaukee 18V Brushless SAWZALL Saw Kit as being the 2821-22 model, but it is actually the 2821-21. Sorry about that! They are are the same exact model, but with slightly different packaging. Your order will still include two 5Ah batteries as listed on the sale. If this is OK with you, great! Nothing else to do on your end and we hope you enjoy your item. If this is a deal-breaker, please let us know and we can assist with a return for a full refund. For return requests or further questions, we can be reached via email at support@woot.com or by going through the Customer Service Support form on the website. Once again, we are very sorry for the inconvenience.
I looked up the -21 and it only comes with one battery. How is the second battery being included? Is the packaging being opened to add it to the case or is it coming separately?
The second battery is separate from the unit. Probably included in the shipping box.
OK, I hope so, because usually the Milwaukee stuff just has a label slapped on and shipped.