Original sentence: Battery: 4-cell (37 Whr) or 6-cell (56 Whr) Lithium Ion battery.Graphics Processor: integrated Intel GMA X4500MHD graphics or ATI Mobility Radeon HD 4330 with 256 or 512 MB of graphics memory (optional as of September 2009).Hard Drive: 160 GB, 250 GB, 320 GB, or 500 GB SATA at 5400 RPM or 7200 RPM.Memory: 2 GB, 3 GB, or 4 GB of shared dual channel DDR2 SDRAM @ 800 MHz (upgradeble to 8 GB)
Edited sentence: Battery:  6-cell (56 Whr) Lithium Ion battery.Graphics Processor: integrated Intel GMA X4500MHD graphics or ATI Mobility Radeon HD 4330 with 256 of graphics memory (optional as of September 2009).Hard Drive: 160 GB SATA at 5400 RPM or 7200 RPM.Memory: 2 GB of shared dual channel DDR2 SDRAM @ 800 MHz (upgradeble to 8 GB)