This DieHard Automatic Battery Charger drops from $64.99 to $40.49 at Sears.com. Shipping adds $12.38, so for the best deal, choose free in-store pickup. However, this is still the lowest shipped price we could find for this charger by $12.12. This portable charger has a 50 amp engine start mode for jump-starting vehicles; a 3-5 hour, 10 amp quick charge mode; a 2 amp trickle for continuous power and spark-proof protection. Sales tax is charged in most states.