PortaCell (9Cells/Samsung, Super Hi-Capacity 7800mAh/87Wh, 11.1V) Laptop Battery PW773, WU946 for Dell Studio PP39L, 1535 Series PortaCell (9Cells/Samsung, Super Hi-Capacity 7800mAh/87Wh, 11.1V) Brand-new OEM compatible replacement Laptop Battery PW773, WU946 for Dell Studio PP39L, 1535 Series Brand-new OEM compatible replacement, meets or exceeds OEM spec. Samsung Cell with longer run time. Free USPS Priority Shipping with One Year Warranty! Free Battery case attached