Battery Tender Junior (6V) The Battery Tender Junior is much more than a trickle charger. It has a brain. It's lightweight, compact, and fully automatic; very easy to use, especially in small spaces. It will keep your battery fully charged so that it is ready to go when you are! * Perfect for all lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell). * Complete 3-step charging program (Initialization, Bulk Charge, Float Mode). * Automatically switches to float / maintenance voltage after fully charging the battery. * If the battery voltage drops too far under load, full charger output power resumes. * Solid state two color LED indicates stage of charger. * Spark proof. * Reverse polarity protected. * 12' output cord. * 5 year warranty!