I am thinking about buying a new laptop. If I do I'l be selling a used Gateway MX6447 in good shape with an extra battery. The original battery works but only lasts about 75% as long as the new one. What is it worth? FeatureDescription ProcessorAMD Turion 64 Mobile Technology MK-36 Operates at 2.0 GHz |512 KB L2 Cache HyperTransport technology at up to 1600 MHzLCD Screen15.4-inch Ultrabright WXGA TFT (1280 × 800)ChipsetATI RS485MMemory1024 MB 533 MHz DDR2 (2 × 512) Expandable to 2 GB Total Slots: 2 DDR2 Slots | Available Slots: 0 DDR2 Slots VideoATI Radeon Xpress 1150 Graphics with up to 128 MB of Shared Video Memory AudioHigh Definition 2 Channel AudioHard Drive120 GB 4200 RPM PATA hard drive Optical DriveDVD+/-RW Multi-Format Double Layer (up to 8.5 GB)Write maximum: 8X DVD +/-R, 6X DVD-RW, 8X DVD+RW, 2X DVD-R DL, 2.4X DVD+R DL, 24X CD-R and 16X CD-RW Read maximum: 24X CD-R/RW/ROM, 8X DVD-R/RW/ROM, 4X DVD+/-R DL, RAMMedia Reader4-in-1 Digital Media Manager Secure Digital (SD), Memory Stick, Memory Stick-Pro, and Multimedia card (MMC)Modem56K ITU V.92 ready Fax/ModemNetworkIntegrated 802.11g Wireless LAN Integrated 10/100 EthernetInterfaces 4 – USB 2.0 Ports 1 – VGA External Connector 1 – S-Video Connector 1 – IEEE 1394 port 1 – RJ11 1 – RJ45 Microphone In Headphone / Audio Out 1 – Kensington Lock Slot 1 – AC Adapter Connector Pointing DeviceIntegrated Synaptics Touchpad with Vertical Scroll ZonePCMCIA1 – Type I or Type II; Card BusBattery6-cell Lithium-ion Dimensions1.31 to 1.40-inches H × 14.09-inches W × 10.39-inches D Weight6.32 pounds