Advance Auto Parts has the Schumacher SpeedCharge Battery Maintainer and Charger (SEM-1562a) for $26 - 20% off with coupon code P20
- $8 rebate
[Exp 10/31] = $14
with free in-store pickup or $10 shipping to home. Automatically switches to trickle charging when battery is fully charged. Compatible with 6 or 12-volt batteries.