Battery Tender 4 AMP Battery Charger and Maintainer - Automotive Switchable 12V or 6V Smart Fully Automatic for Cars SUVs and Trucks - Lead Acid & Lithium Battery Charger - 022-0209-BT-WHSTAY CHARGED: The 4 AMP car battery charger automotive provides a full charge to your machine's battery before automatically switching to float mode to maintain proper voltage levels for your battery without overchargingFULLY SELECTABLE: With the push of a button, easily switch from AGM or flooded and lithium ion (LiFePO4) batteries to provide and maintain an optimal charge level for 6 and 12 volt batteries alikeHIGH POWERED: 4 amp switchable car battery charger automotive delivers a powerful charge to keep your car, SUV, pickup truck, or boat battery at peak performance by providing reliable engine starts and extended battery lifeEASY TO USE: A low maintenance design that's quick and simple to use, our switchable automobile charger and maintainer is compact and lightweight to operate everywhere, even in small storage spaces