As one of its daily deals, Kmart offers the Battery Tender Jr. 12-volt Battery Maintainer
, model no. 021-0123, for $19.99
. Even better, Shop Your Way Max members bag free shipping
. (Not a SYWM member? Sign up for a free 90-day trial
. Non-members can also choose in-store pickup to dodge the $6.50 shipping charge. Amazon
charges the same.) That's tied with our March mention and $8 below the best price we could find elsewhere. 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.