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That's not a major problem. It's trivial to let it click to a different brightness, and then the battery will last all day.

I wish. Flashlights tend to have all sorts of strange UIs, just like television firmware are just exploring the possible ways of being annoying.

None of mine have both a way of getting full power fast /and/ deterministically turning it on on the lowest setting.

(Except for the one that only has 'very bright' and where I first wondered why there is no rebound when I turn it on.)