Chrome Battery has a great selection of the most reliable 4-AMP battery Chargers/Maintainers. Xtend Chargers offers our 4 Amp Charger to replace your existing battery charger and bring your battery back to life. Our fully automatic 4-AMP Xtend Chargers provide a charge when needed, then stops charging when your battery is fully-charged and the built-in circuit protection guards against overcharging and reverse polarity. We offer FREE Shipping on all our Xtend 4-AMP Battery Chargers!