change resolution automatically when on battery

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freelancer91

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Is there some way that I can get my computer to automatically change the resolution to the lowest setting when I switch to DC power? I have already taken just about every step possible to increase battery power, but to really see improvements, I need to change the resolution to the 800x600 setting. Is there some background program that can do that for me when I switch to battery power?
 

My Computer

Computer Manufacturer/Model Number
Custom Desktop, Dell Studio XPS 1340 laptop
OS
DT and LT: Windows 7 and Fedora 14
CPU
DT: Intel QX9770, LT: Intel P8600
Motherboard
DT: Intel DX48BT2
Memory
DT: 8GB OCZ DDR3 PC3-10666 Gold Edition LT: 4GB DDR3-1066
Graphics Card(s)
DT: BFG Geforce GTX 295 (B), LT: NVidia Geforce 9400M G
Sound Card
DT: Integrated LT: Integrated
Monitor(s) Displays
DT: Acer 23 inch 1920x1080 monitors, LT: 13 inch
Screen Resolution
DT: 3840x1080 LT: 1280x800
Hard Drives
DT: Samsung SpinPoint 1TB HD103UJ 7200RPM HDD+Fantom Drives 2TB 7200rpm External+OCZ Vertex Series 30GB SSD (boot)
LT: Seagate Momentus 7200RPM 320GB 2.5'' HDD
PSU
DT: Rosewill Bronze Series 1000W LT: 6 cell 62837mWh Li-ion
Case
DT:Thermaltake Armor Series LCS, LT:Dell Black Studio XPS 13
Cooling
DT: Custom watercooling setup
Keyboard
DT: Kengsinton PC/Mac LT: Integrated backlit keyboard
Mouse
DT: Logitech USB Optical Mouse LT: Integrated Track Pad
Internet Speed
380KB/s download on a good day...
Other Info
DT: CD/DVDRW Drive: Hp dvd1140, Multifunction front panel w/ 4 USB ports (2 Powered with 5V and 12V), Powered External SATA, 25-in-1 card reader, and audio ports

LT: Integrated Webcam with Microphone array, 8-in-1 card reader
Changing resolution isn't going to buy you any extra battery life.
 

My Computer

Computer Manufacturer/Model Number
Custom
OS
Windows 7 Ultimate RTM (Technet)
CPU
3.00 gigahertz Intel Core2 Duo E8400
Motherboard
ASUSTeK Computer INC. P5K/EPU Rev 1.xx
Memory
4GB
Graphics Card(s)
ATI Radeon X1950 Pro
Sound Card
Built in HD Audio
Monitor(s) Displays
22" Gateway LCD
Screen Resolution
1920 x 1200
Hard Drives
ST3160023A [Hard drive] (160.04 GB) -- drive 0, rev 8.01, ST3500630AS [Hard drive] (500.11 GB) -- drive 2, rev 3.AAK
ST3500630AS [Hard drive] (500.11 GB) -- drive 1, rev 3.AAK
Keyboard
Logitech G11
Mouse
Microsoft Wireless Laser Mouse 5000
Internet Speed
13.44 Mbps
How would that not increase battery life. You are making the GPU render fewer pixels, thus decreasing the workload. Am I right?
 

My Computer

Computer Manufacturer/Model Number
Custom Desktop, Dell Studio XPS 1340 laptop
OS
DT and LT: Windows 7 and Fedora 14
CPU
DT: Intel QX9770, LT: Intel P8600
Motherboard
DT: Intel DX48BT2
Memory
DT: 8GB OCZ DDR3 PC3-10666 Gold Edition LT: 4GB DDR3-1066
Graphics Card(s)
DT: BFG Geforce GTX 295 (B), LT: NVidia Geforce 9400M G
Sound Card
DT: Integrated LT: Integrated
Monitor(s) Displays
DT: Acer 23 inch 1920x1080 monitors, LT: 13 inch
Screen Resolution
DT: 3840x1080 LT: 1280x800
Hard Drives
DT: Samsung SpinPoint 1TB HD103UJ 7200RPM HDD+Fantom Drives 2TB 7200rpm External+OCZ Vertex Series 30GB SSD (boot)
LT: Seagate Momentus 7200RPM 320GB 2.5'' HDD
PSU
DT: Rosewill Bronze Series 1000W LT: 6 cell 62837mWh Li-ion
Case
DT:Thermaltake Armor Series LCS, LT:Dell Black Studio XPS 13
Cooling
DT: Custom watercooling setup
Keyboard
DT: Kengsinton PC/Mac LT: Integrated backlit keyboard
Mouse
DT: Logitech USB Optical Mouse LT: Integrated Track Pad
Internet Speed
380KB/s download on a good day...
Other Info
DT: CD/DVDRW Drive: Hp dvd1140, Multifunction front panel w/ 4 USB ports (2 Powered with 5V and 12V), Powered External SATA, 25-in-1 card reader, and audio ports

LT: Integrated Webcam with Microphone array, 8-in-1 card reader
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