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Get this DieHard Automatic Battery Charger for $39.99 at Kmart.com. Add two to your cart for $79.98 and apply coupon code KAUTO to cut them to $59.98. With free shipping, that's $29.99 each and the lowest total price we could find for two elsewhere by $44. This device lets you charge your car battery from inside the vehicle and features 2 amp trickle, 10 amp fast charge, and 50 amp engine start. Sales tax is charged in most states.