broken charger socket

My navman f series has a dodgy in car charging plug, and now the mini charging socket has snapped off taking the contacts with it, so I will need to cut the plug off the charger and solder it permanently inside, the problem is where do I solder it? directly across the battery terminals or does it need to go somewhere specific on the mother board? as I said the original contacts on the charging socket have been ripped off.
Any tips gratefully recieved.
Steve

i would buy a part of m*plins and as a friend to install it .

some usb hubs use them type of plug for ref so if u got one take it of that ;-).

cheers highway1, but the problem is that when the mini usb socket pulled away from the board, it took the contacts with it so there is nowhere to solder a new socket onto, hence the question about connecting direct to battery, but don't want to blow battery up.
steve