Will the MiniDrive affect my computer's battery life?

The short answer: Yes, but not by much.

The longer answer: Yes, a little, but how much largely depends on the microSD card. Current microSD cards across different brands and sizes span a range of wattages, ranging from 66–360 milliwatts. For the average MacBook Air with a 50 watt/hour battery and a 7-hour battery life you can expect a loss of around 4 minutes with the more efficient microSD cards and anywhere up to 19 minutes for the more wasteful models.

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