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I don't know if there is a manual trunk release or not, because I have no access to Maserati owners or repair manuals but the cigar lighter should be a direct line to the battery so you should be able to charge the battery back up by using a battery charger and an adapter plugged into that cigar lighter socket, like this http://cdn.shopify.com/s/files/1/0661/9627/products/Cigarette_Power_Adapter_1024x1024.jpg?v=1421218519
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