2 free Batteries? don't kits normally come with 2 batteries? It's listed as a kit is this really only available as a kit for a limited time?

The deal includes two *additional* free batteries, for a total of four batteries. If you add it to your shopping cart, you will see the free battery 2-pack added automatically. The kit is not a limited time offer, but the 2 extra free batteries are for a limited time while supplies last.