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Also, keep in mind that that's direct-drive (at this price, you're not going to get a buck-boost CC driver) - you won't get 45 minutes of steady 1400 or whatever lumens. As the current level in the battery drops, so will your output. That's just how electricity works.
[1] That guesstimate is ignoring heat - in actual use, I'd expect the driver to step down pretty soon on a light this small so that you don't burst into flames. It the step-down is on a timer (common on cheaper lights), it will behave the same way every time, and probably step down in ~3-5 minutes. If it has a temperature sensor, step-down will depend on your environment, but again on something with as little mass as this to serve as a heat sink, it won't vary that much unless you happen to live in Antartica. It is difficult to argue with physics.
It also will step down as the battery voltage drops off (to avoid over-draining the battery).