Take 20% Off DieHard Automotive Batteries at Sears.com. Plus, get an additional $5 off when you use coupon code SEARS2013 at checkout. This sale is today only and is for in-store pickup only. For example, this DieHard Gold Automotive Battery (Size 35) drops from $124.99 to $99.99 to $94.99. Note: This price requires the exchange of your old car battery and installation services are available for $19.99. Sales tax is charged in most states.