Today only, Sears offers the DieHard Platinum 6-volt / 12-volt Battery Charger and Maintainer for $23.99. In-cart, it drops to $21.59. With free shipping, that's $23 off list and the lowest total price we could find. Sales tax is added where applicable. It features a 3-amp charge, scrolling digital messages, float-mode monitoring, auto voltage detection, reverse hook-up protection, versatile quick-connect harness, and more.