You can only use the ' matching Tips' Warning : DO NOT try to force wrong tip in your laptop. The other end is called 'TIP' which you will plug this tip into the 'DC IN' in your laptop. MacBook Pro with Retina display, macOS High Sierra (10.13. You use this end to plug into wall power outlet. Basically, apple macbook pro 17' a1297 laptop AC adapters comprise of 2 ends. Different laptops have different connectors.Computers only draw as many amperes or watts as they need. The adapter's output current (Amps) and output power (watts) are maximum load ratings. Adapters with higher Amps will not damage your laptop computer. You can choose a replacement ac adapter which has higher Amps than your original ac adapter's, but you can not choose an ac adapter which has lower Amps than your original ac adapter's because it can not provide sufficient power to your laptop. You can calculate your original apple macbook pro 17' a1297 ac adapter's output Wattage by multiplying the Ouput Voltage by output current i.e 20.0V X 4.250A = 85 Watts.Using wrong output voltage adatper will damage your laptop computer. 85W Power Adapter L-Shaped Connector Charger Compatible with MacBook PRO Charger, Find Details about Laptop Adapter, Laptop Charger from 85W Power Adapter L-Shaped Connector Charger Compatible with.

you could buy the 85w ones as my back up. It should be noted that higher wattage chargers can be used on the lower wattage laptops, but not vice versa.For example,If you have mac laptops that have used all three wattages. Laptops with 18V~20V input voltage can use our ac adapter which has 19V output voltage Laptops with 15V~17V input voltage can use our ac adapter which has 16V output voltage Remember : never exceed ☑V tolerance. There are three kinds of power rating Macbook power adapter in the market,45 watt, 60 watt, or 85 watt.

Before ordering this replacement apple macbook pro 17' a1297 ac adapter, you MUST check your laptop's input voltage and your original ac adapter's output voltage.

2015 macbook pro charger wattage