Battery Tender Junior's lightweight, compact size makes it ideal for those hard-to-fit spots. The trickle charger with a brain will assure batteries are maintained after charging and allows ready to go! Fully automatic two-stage lead-acid battery charger. Perfect for all lead-acid, sealed maintenance free and gel cell batteries. After reaching peak 14.4 VDC, charger automatically switches to 13.2 VDC float voltage. When voltage drops below 12.6 VDC, charger resumes charging back to 14.4 VDC. Solid state two color LED indicates stage of charger. Spark proof. Reverse polarity protected. 12' output cord. 5 year warranty