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15h on light use is a full workday of more heavy tasks

And how often do you work a full day with no access to a charger?

Every other day if you like to travel and/or work from coffee shops

> in the middle of a safari?

Long running batteries would have been useful when I first was on safari in 2002. But last year I was on safari again, and at camp there was power and wifi in the tents. It actually kind of killed some of the romance.

I feel the same way with smartphones, everyone wants more battery. Ten years ago it might be difficult to find a place were you can charge your phone but now there are sockets everywhere.