Cigarette lighter always on

[Manthorp]

Hi all.  On my previous car, the power outlet was always on.  This was a great convenience for charging my bluetooth hands-free headset, which I only use when I'm driving.  in my new Mazda 2TS, however, the power outlet is off when car power is switched off, so I have to take the headset into the house, charge it and remember to take it back to the car.

Is there any way I can hotwire the cigarette lighter so that it's always on?  The bluetooth headset draws very little power and I'm not worried about it ever flattening the battery.

Steve