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Battery. You might get 3 to 10 years out of it depending on usage (maybe x4 if WiFi is mostly off) and ambient temperature.
Flash does sort of fade, so exactly how long it lasts being refreshed by FW updates and replacing books is hard to say. Probably more than 10 years. It's the much higher capacity Flash used as laptop replacement drives that's much more short lived. It depends on cell size, bits per cell and layers of 3D NAND.
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