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Keep in mind also, that the hybrid battery fan blows air across the small 12-volt battery in the trunk (after it has passed over the big hybrid battery). This air either blows out a vent below the 12-volt battery (if the main cabin air is not in recirculate mode), or blows into the trunk, then past the back seat back into the main cabin (if the main cabin air is in recirculate mode). So, if you do a lot of driving with air set to recirculate, and your 12-volt battery is releasing sulphury fumes that aren't making it through the battey vent tube, these can get into the trunk and main cabin. It only takes a tiny bit to make a noticable odor.
 
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