Costco Sale: Battery Tender 3.0 Amp Battery Charger $29.99

*UPDATE* 12/10/18. This battery charger fully recharges and then maintains a battery at its proper storage voltage without the damaging effects caused by trickle chargers. Select Costco locations have the Battery Tender 3.0 Amp Battery Charger on sale for $29.99 (after instant savings), now through December 17, 2018. That is $10 off Costco’s regular price of $39.99. While supplies last. Features: • Input 120VAC @ 60 Hz • Output: 12 Volts…