The usb charger is always connected so I don't really know how long it lasts. I'm imagining it'd last for at least a few hours before needing a full charge.

 

Can you give some more details on how you spliced the wires? I have the accessory sleeve and am trying to do the splice. Did you disconnect the wires from the back of the lighter and splice those directly to the wires on the sleeve? Thanks.

 

I'm not 100% sure now, but I'm pretty sure I stripped some insulation back and soldered wires directly onto the bare metal. You can also just use wire tappers (available at hardware stores or electronic stores). You'll connect it to the leads on the accessory sleeve, and then clamp down on the wires on the cigarette lighter.

One thing to watch out for is to tie your new wires down with enough slack so that the door retracts properly. First time, I didn't leave enough slack and the door opened very slowly.

EDIT

So I never disconnected any of the stock wiring, I just spliced into the original wiring. I still wanted to be able to use the OEM 12V socket.

 

I have that same navi and trying to do the same thing.. if you got it done send me some pics pleasee