What will happen if the power supply of your Dell Notebook stop to work ? Scary thought. Of course, you need a spare. You can also stop lugging your AC adapter 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. This 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.

Specifications:

Input Voltage Range: AC 100V - 240V
Input Current: 1.5A
Output Voltage: DC 19.5V
Output Current: 3.34A
Note: Non-OEM product. 100% compatible with DELL PA-12 power supply at fraction of the price. Even comes with 6 months warranty.

Dimensions: 6" x 2.2" x 1.4" (15.2cm x 5.6cm x 3.6cm)

Works with :  

LATITUDE: D-400, D-500, D-600, X300
PRECISION M20 MOBILE WORKSTATION
INSPIRON:300M, 500M, 600M, 510M, 700M