Do Hand Warmers Even Work At 17 degrees F (-8.3C)?

Before taking these hand warmers hiking I wanted to check if they will even work when it is really cold. This morning it is 17 degrees F (-8.3C). I left my different hand warmer types out all night so they will be starting "cold"- if they start at all. Hothands, HotSnapZ, electric rechargable hand warmers and the Zippo Fuel hand warmer- are any of them up to the task?

Check out my handwarmer review playlist here- https://www.youtube.com/watch?v=orfXOx02Tfg&list=PLAZ5PllxgsawYt6HCsiUGpObmTBgwlUOe

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A few years ago I convinced myself I was in-shape enough to climb the highest mountain in Texas- Guadalupe Peak- https://youtu.be/S2S1y-Un2kU Things didn't go as planned!

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