http://s.shld.net/is/image/Sears/02833023000-2

Sears has a nationwide network of car maintenance shops called Sears Auto Center that has been quite popular for tire, battery, and alignment work for decades.

http://www.sears.com/automotive-services/c-1023947

Information about its warranty are printed in large letters on the side. It would be quite difficult to purchase this battery without understanding it has a warranty. This is not atypical. It is extremely common for batteries to have such information printed legibly on the side. Furthermore, car batteries typically have a punch out on the top designating the month and year of purchase. These are punched out at time of purchase and enable the warranty can be honored even in the event of losing one's receipt.

Battery displays in stores nearly always contain comparative information about the warranty periods, with premium batteries highlighted for having longer warranty periods.

I find it astonishing that people can buy batteries and never notice any of this, and some of these people are here claiming that owners whose Teslas become bricked are at fault because the manual obliquely suggests in an obscure section that bricking is possible, a possibility that is at the same time denied by the same group.