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Mosfet longevity questions

Pauly Walnuts

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I just received my first box mod. It uses a mosfet and this brings up some questions.
1. How long should the mosfet last?
2. Other than solder welds breaking, How do these typically break? Dropping, overuse, over power?
3. Any tips on keeping my mosfet working reliably.

I did not actually want to go this route, I was looking for a purely mechanical box. However, I got such a good deal I could not pass it up. For lifespan, a simple mechanical contact switch would be better than any piece of electronics, but since I have it now, I want to know how to make it last.

Thanks guys
 

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