If it is not charged it will not turn on. If you have a bad battery (which is the case if it won't fully charge) your only choice is to return to Garmin.
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The nuvi 200 series, 300 series, 600 series, 700 series, 1000 series and the
StreetPilot C300 and C500 series do not have user replaceable batteries. These
units must be sent in to a Garmin approved repair facilities if a battery
issue arises. Garmin
and Raytech are the
only Garmin approved repair facilities. Raytech
is a repair
Canadian customers. To
repair your device please contact the specific repair facility for your region.
If your device is not still under the 1 year warranty, there will be a cost
associated with the repair
of your device. Go here for repair: