Sears offers the DieHard Battery Charger and Tester, model no. 71225, for $62.99. Coupon code "SEARS2012" cuts it to $57.99. Opt for free in-store pickup to avoid the $13.56 shipping charge. That's $22 off and the lowest price we could find. Sales tax is added where applicable. This battery charger and tester is compatible with 6-volt and 12-volt batteries. It allows you to test batteries for your car, truck, RV, farm equipment, snowmobile, motorcycle, and more.