Not exactly free, but arguably so. Read on for more details ...
HERE is the deal.
I won't be surprised if these sell out fast, or at least if the "free" ShopYourWayRewards (SYWR) points get pulled from the deal. And this is only a good deal because you're getting those free SYWR points - which you should CLEARLY see in your Sears.com shopping cart before checkout. If you don't see them, then don't buy these.
If you're not familiar with SYWR points, they are basically rewards that you can use to buy future merchandise at Sears (or Sears.com). So the cheaper battery, for example, costs $15 now. But they give you $15 in SYWR points to use on a future Sears purchase (anything from home goods, to tools, to the Sears Auto Center).