Samsung Official OEM Car Charger for your SGH-A797 Phone! Original Equipment and Manufacturer (DC 12 volt) Safely charge your phone from your car using the original authentic brand! Using the authentic OEM brand will ensure your phones warranty is never voided! Use of this official charger will prolong your batteries life compare to others! As designed for your warranty, stage one charges quickly to 80%. Then, stage two slowly and precisely charges to 100 percent.