BatteryMinder 128CEC1: 12V 2/4/8 AMP Battery Charger-Maintainer-Desulfator Designed for Cars, Trucks, Motorcycles, ATV, Boats, RV, Jet Skis, Snowmobiles, Generators, Golf Carts, etc. EXTENDED BATTERY LIFE: Automatic full-time desulfator reverses sulfation (a buildup of lead sulfate crystals) - the primary cause of early battery failure by using a patented range of high frequencies to safely remove sulfation and recondition weak batteries. Sulfated batteries once considered beyond recovery can now be brought back to long-term useful condition; extending battery life up to four times when compared to new batteries not being properly maintained. AMBIENT TEMPERATURE SENSOR Temperature compensation precisely adjusts battery voltage based on temperature sensor readings. This ensures your battery will always be properly charged and maintained no matter what conditions it is subject to. Reverse polarity, short-circuit and over temperature protection. EIGHT BATTERIES AT A TIME - Maintains up to eight batteries at a time when connected in parallel. Requires the use of Y-Connectors 210AY (sold separately). Ideal for winterizing Cars, Trucks, Motorcycles, ATV, Boat, RV, etc. The 90-240V AC 47-63 Hz input allows for worldwide use. 2/4/8 AMP  Use the 2 Amp setting for batteries that are charged and in good shape. Use the 4 Amp setting when charging more than one battery or a large deep cycle battery. The 8 Amp setting is best for wet/AGM/sealed batteries. Use the Odyssey selection for all Odyssey batteries. FCC CERTIFIED - Certified by the California Energy Commission as meeting the current efficiency standards, which means it meets strict energy efficiency guidelines set by the US Environmental Protection Agency and the Department of Energy. High efficiency and low power consumption. If you know the battery is charged and in good shape use the <span class="a-text-bold">2 Amp</span> setting. If you are charging a large deep cycle battery or more than one battery than use <span class="a-text-bold">4 Amp</span> setting. You will probably use the wet/AGM/sealed selection most of the time. Use the Odyssey selection on all named Odyssey batteries at the <span class="a-text-bold">8 Amp</span> setting. Will not overcharge/undercharge between temperature extremes considered safe to charge or maintain by major battery manufacturers. Push-button Selection for ALL battery types and charge rates. Includes Short circuit, spark, reverse polarity protection, thermal runaway protection, automatic D/C disconnect on A/C failure and quick-connect/disconnect fused alligator clip assembly. Ambient temperature compensation. Built-in temperature sensor automatically adjusts charge rate to ensure full-charge between temperature extremes considered safe to charge or maintain by major battery manufacturers. Model 128CEC1 Charger-Maintainer-Desulfator 6&#039; AC cord, 6&#039; DC cord with quick connector (SAE) Auto-Temp Compensation Sensor (Installed) Insulated Battery Clip Cord Set with Quick Connector and 15A replaceable fuse Ring Terminal Cord Set with Quick Connector and 15A replaceable fuse