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IMpORTANT SAFETy INSTRUcTIONS. 1. SAVE THESE INSTRUcTIONS –. This manual contains important safety and operating instructions for this battery charger. Find helpful customer reviews and review ratings for Cen-Tech 60581 Manual Car Battery Charger with Engine Start, 10/2/50 Amp/12V at Amazon.com. Special attention should be given to WARNING and. CAUTION labels on the charger and in this manual. Battery chargers are safe when properly operated.