Get this Schumacher Automotive SpeedCharge Battery Trickle Charger at Walmart for $19 after instant savings. Shipping is $1.97 or opt for free in-store pickup. This same charger is sold at Advance Auto Parts for $26.99
. It features an LED indicator light, works with both 6 & 12 volt batteries, has reverse-hookup protection and weighs 2.5lbs.