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: Rectangle Tip / Square tip 11mm x 4.6mm Output: 20V 2.25A UK Three-Pin Plug Power Cord  Fit for models :   Lenovo IdeaPad Yogas new rectangle tip with pin in the centre Lenovo Yoga part number: ADLX45NLC3, 36200246, 45N0293, 45N0294 and many more  Please check compatibility with your laptop carefully as laptop models do vary.