6/4/2 AMP Charge Rate 12 Volt Battery Charger Fully Automatic/High Frequency! Features: 8 minute charge to start * (bulk charge/rapid start); 3-stage high frequency switch mode automatic rapid charging; Lightweight, high efficiency design; 3 LEDs display charge rate selected; Cables and clamps self stored; Charging complete indicator; Reverse polarity indicator; Spark resistant reverse polarity and short circuit protection for user; Microprocessor control (Digital Smart Control); Compensates for low AC from extension cord use; High frequency power conversion technology

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