AC Doctor INC New 6 Cell 5200mAh Laptop Battery Replacement for Dell Studio 1735 1737 RM791 KM973 US 6 cells replacement for part numbers li-ion rechargable Dell KM973 KM974 KM976 KM978 PW824 PW823 RM868 RM870 RM791 MT335 Studio 1735 1736 1737 laptop battery. Specification: 11.1V 5200mAh black 299.80x49.50x37.60mm 326.85g. CE RoHS certified, safe use.60 days no worry to return or exchange item, 12 months customer service warranty Full compatible with your original battery, brand new direct from Professional Manufacturer. 6 cells laptop battery standby time about 2 hours, use time about 1-2 hours.