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A few hours less than OS X I think. I haven't done exhaustive testing (that year of Macs were a massive improvement in terms of battery life)

FreeBSD battery life is generally good, especially with https://github.com/lonkamikaze/powerdxx

Never got to try how much this Macbook did in macOS (I bought it used just to tinker with Linux/FreeBSD, but the time I used it, battery on FreeBSD was on par with Linux, if not slightly better.

I don’t think I ever had my laptop battery run out on me. To me it’s just not an issue. I’m plugged in 85% of the time.

How do people use their laptops? For me it's almost always at a desk and if not there is always a plug nearby.

I sit on my sofa. Not the best thing for my back, but that's what I do.