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I have not experienced the smell you have noticed, but consider this: The 12 volt battery is a lead-acid type, and is located in the trunk, between the left wheel well and the left tail light. It is covered by a step-like cover.

The battery has a vent tube that comes down the rear side of the battery and through a rubber grommet in the floor of the trunk, to the underside of the Prius.

If the battery was being overcharged it could emit the sulfur smell. The battery may be damaged (cracked) or the tube is not through the grommet, or is plugged up.

It may be worth checking it out.

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