Garmin C530, hardwiring cable to it
 

How can I hardwire a cable from the cig lighter into a Garmin C530?

Gone through enough cords and the battery is long gone, so this is a viable thing to do. But I don't know where to solder the wires too....

It's a rectangular connector like this I'm trying to bypass:

http://i4.ebayimg.com/08/i/001/27/86/1ea6_12.JPG

There's a phishy Russian website that has pinouts of the Garmin device connectors if you're looking for pinouts.