2. Use the right charger
Apple uses a few types of chargers for different MacBook models. The MagSafe 1 and 2 chargers come in 45W, 60W and 85W. The USB-C chargers come in 30W, 35W, 61W, 67W,87W, 96W and 140W. The new MagSafe 3 chargers come in 67W, 96W and 140W.
You may quickly get confused with the chargers if you have a few MacBook Airs, MacBook Pros, iPads and iPhones in your household. The low-wattage adapters are used in low-power consumption MacBooks like MacBook Airs and 12" MacBooks, while the high-wattage adapters are used in 15" and 16" MacBook Pros.
If you use a low-wattage adapter in a high-power consumption MacBook, the power adapter barely provides enough power to run your MacBook but not enough power to charge the battery.
For example, if you connect a Macbook Air charger (30W) to a 15" MacBook Pro (87W), you could get a battery not charging notification, and the charger will get hot very soon. You may still use your MacBook without draining its battery, but the battery won’t charge. If you turn off the Mac or put it to sleep, the power adapter will start charging the Mac.
Please refer to Apple’s website to find out the original stock adaptor for your MacBook. Identify your Mac power adaptor.
No matter how many Apple chargers you have, the basic rule is that the high-wattage charger can replace the lower-wattage charger, not the other way around. You may notice the high-wattage charger outputs a higher voltage, but it doesn’t matter. The MacBook charging circuit on the logic board will automatically adjust the voltage for your MacBook. So a higher-wattage charger will not harm your MacBook.
Also, the MagSafe 1, MagSafe 2, and MagSafe 3 chargers are not exchangeable as the size of the connectors are slightly different. You can’t fit a MagSafe 3 plug into a MagSafe 2 charging port.
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