As one of its daily deals, Kmart offers the Battery Tender Jr. 12-volt Battery Maintainer
, model no. 021-0123, for $37.99. In-cart, it falls to $19.99
. Choose free in-store pickup
to avoid a $6.50 shipping fee. That's tied with our January mention and $3 below the best shipped price we could find elsewhere. Sales tax is added where applicable. It features a 4-step charging program, automatic shutoff, 12-foot output cord, and compatibility with all lead-acid, flooded, or sealed maintenance-free batteries. Deal ends today.