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Series 20Amp 3 Bank Battery Charger Five Reasons to buy a Charles Battery Charger1. Fully Automatic Recharging of Different Battery Types Charles chargers will automatically recharge up to 3 banks of batteries simultaneously. Accurately and efficiently recharge to promote battery longevity, saving you money! Charles SP & SP chargers feature a battery type selector switch, which can be set to charge lead-acid, gel or AGM batteries.2. The Ability to Simultaneously Recharge and act as a Power Supply Whether charging or not, the Charles chargers can also provide constant DC power to run DC loads like automatic bilge pumps and DC lights.3. Built for the Marine Environment with Safety in mind Chargers feature thermal, over-current, reverse-polarity and ignition protection. Constructed with the highest quality corrosion-resistant, UL recognized components and enclosures. These rugged chargers provide trouble-free power in the marine environment.4. Marine UL Listed The Charles Series have passed the rigorous safety and performance tests of Marine UL. Don't be fooled, only chargers that bear the Marine UL mark have achieved Marine UL approval. An excellent choice for value-priced, high-performance DC charging, the SP Series units include a battery type selector switch allowing you to charge Lead Acid, Gel or AGM batteries. Features 3-stage charging, which delivers the greatest charge when the battery is most able to accept it, prevents overcharging and extends battery life. Restore up to 3 banks simultaneously. Other features include the ability to act as a power supply, ignition and reverse-polarity protected, easy-to-read DC ammeter, corrosion resistant components and housing, heavy-duty heat sink design. Runs cool and quiet, no RFI/EMI interference, meet FCC Class B requirements. Exterior slots allow for easy mounting, not Marine UL listed. Mfr?s two year limited warranty. 12 volt, 10- models. 12voltSh. Wt. 20 lbs. FREE Shipping Over $100, No Sales Tax