It depends on the battery voltage, but 12V DC will not even power up your 120VAC stuff, let alone draw enough power to blow stuff up. The switching supplies in your wall-powered electronics have under-voltage lockout (UVL), so they will not even try to power up. Toasters and such will not have enough voltage to make the heat or draw significant power.
Your stuff will NOT smoke.
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I'm not coasting, I'm shifting slowly.
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