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If the battery is in good condition, just a couple hours. Plug the charger into the unit and you should see a yellow lightning bolt over the battery status indicator. 4 green bars means the battery is charged. Anything less and it is not.
To leave the unit in charge, press the on/off power button until the screen says battery charging. You can check the charging status by just touching the screen. If it says battery charge complete, then you are done.
When you leave a Nuvi on a charger for several hours and don't see full green bars, this is an indication that the battery is defective. Most Nuvi batteries last about 2 years. Most of the batteries have a date code of 2007. I would have the battery replaced as soon as possible as it can bloat and crack the case open. More info can be found here:
folks, the garmins have an on-board battery that needs to be powered up (at least occasionally) via the usb port - like from your computer. just using the dc car power cord does nothing for this battery. i've had this exact same problem on both my 760 and 780 nuvi units. fixed it using the usb charge. seems to run down differently for all the various nuvi models. my regular charge will hold for 7 hours on my old 660, my 760 and 780 work about 5 hours. my 'power up' failed on the 660 after 10 months with no internal battery charge, but the 7xx models only took about 5-6 months to 'fail.' hope this helps. jack b :-) in midland, tx usa
The only options you have when it comes to a locked unit is to enter the correct PIN, go to the location where the PIN was set, or send the unit back to Garmin. There is no way to unlock a PIN locked unit without the correct PIN or location.