Stop lugging your AC adapter and power cord back and forth between home and office. Get a second AC adapter for your notebook and keep one in the office and one for home or travel. The Dell 90-watt AC adapter enables you to operate your notebook or charge the battery from electrical power outlets. If you are running your computer on AC power with a battery installed, this adapter charges the battery (if needed) and maintains its charge. When the system is off, the AC adapter will charge the battery and then maintain its charge. The adapter's unique cord-wrapping design enables a neat and easy package for travel and storage. This product has been tested and validated on Dell systems to ensure it will work with your computer.