Battery Tender® 4 AMP Battery Charger and Maintainer, 6V/12V, Lead Acid and Lithium Selectable smart battery charger is versatile and powerful! The ideal battery charger for automotive, marine, powersports and maintenance repair shops. Equipped with a 4-Step Automatic charge process which will fully charge and maintain your battery indefinitely. Battery Tender® Battery Chargers won’t overcharge or discharge your battery, it will charge and maintain your battery so it's ready when you’re ready to go. This 4 amp will allow you to select between 6-volts and 12-volts, lead acid or lithium charging and assign the proper voltage. Connecting and Charging is as Easy as 1-2-3 Works with both 12V and 6V. Auto, Marine and and Power sport battery charger. Selectable for AGM?Standard/Gel or Lithium (LiFePO4) * 12V only for Lithium. EASY TO USE: A low maintenance design that's quick and simple to use, our switchable automobile charger and maintainer easy to use, just connect it and forget it SAFE AND SECURE: Our battery charger and maintainer is spark-proof during lead connection and automatically detects reverse polarity to ensure a correct, locked-in connection before providing power Dimensions: 6.8” x 3.68” x 1.96” (charger only), shipping Weight: 3.15lbs Includes Rings Terminal and Alligator Clips Battery Voltage: 6/12-volt Cord Length (Feet): 6 Alternator Check: No Amperage: 4 Automatic Shut-Off: Yes Desulfation: No High Frequency Charge: No Package Quantity: 1 Power Source: Electrical outlet Rechargeable: No Reverse Polarity Protection: Yes Warranty: 5-year limited CA Residents: Prop 65 Warning(s): Yes Safety Listing: UL safety listing UNSPSC: 26111700