The lowest voltage that my MacBook Air seems capable of running on is 13V. The power plug that comes with the mac apparently runs at 16.5. My battery has a manually adjustable output voltage, which I've had at 16V up until now.
At 12V the MacBook does not detect the external power source and just runs on battery.
At 13V it runs off the external power, and while I initially didn't expect it to charge the battery( given that the Mac Airline 15V charger does not), it does actual charge it.
Running at a lower voltage means using less power, and the laptop can also run cooler without any performance degradation.
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