Replacement Laptop AC Power Adapter/Charger for Laptop 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, the 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. Made from highest quality parts each replacement adapter confirms to specifications similar and guaranteed to meet or exceed your laptop's minimum requirements. Each adapter also passes necessary authentication certifications like CE, ROHS etc. Before leaving the factory, so you can be rest assured for its quality, durability and performance.