Please check compatibility with your laptop carefully as laptop models do vary.Ensure you have the correct Tip, Output Voltage and Amp Rating from your previous charger.The AC power adapter enables you to operate your Macbook or charge the battery from electrical power outlets.If you are running your Macbook on AC power with a battery installed, the adapter charges the battery ( if needed ) and maintains its charge.Tip: Magsafe 2Output: 15V 3.65A 60WUK Three-Pin PlugHigh quality replacement laptop charger designed to work identically to your original adapter. Guaranteed to meet the specifications of the original and ensure that they comply with strict UK and EU regulations. The package is sealed for protection against moisture, humidity and contamination.You could also use it as a spare AC adapter so you can charge your Macbook at work or elsewhere without having your original AC adapter with you all the time. Manufactured to strict and stringent quality standard certificates: CE, RoHS, etc.