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I followed the instructions of the Online manual for the Garmin Street Pilot c-340, I removed the faceplate of the Street Pilot and then using my thumb pressed down on the reset button. I then pressed the power on button on the side of the device- the screen lit up, I then plugged one end of the USB cable into my computer and the other end into the device. The information on the screen of the device indicated the Lithium Battery was charging properly.
I have a 100v A/C power / charger unit for my garmin C340 GPS that I use to charge my Garmin's battery every day. I can use thj adapter to run the GPS, or just turn it off and let it charge the GPS. But it connects dirctly to the Garmin GPS unit, not to the cradle like the Cigarrette lighter unit does. .
The only way to update the maps is to purchase new maps from Garmin and download them via the computer. The 2008 map updates are currently available, and Garmin has told me new maps will be out in a few months.