Please check compatibility with your laptop carefully as laptop models do vary.Ensure you have the correct Tip Size, Output Voltage and Amp Rating from your previous charger.The AC power adapter enables you to operate your laptop 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.Tip Size: 4.75mm x 4.2mm x 1.75mm TipOutput: 18.5V 3.5AUK Three-Pin Plug Power CordPlease check compatibility with your laptop carefully as laptop models do vary.