Being plug into a car charger (or wall charger) has little to do with not finding a GPS signal and this apply to your gps battery as long as you get power to your receiver.
It is not unusual for GPS to have problem finding suitable Satellites signals especially inside a building or areas where you do not have a clear view of the sky above you and the unit (e.g. High Rise buildings).
In order to speed up the location of satellites signals, you need to update your unit A-GPS Satellite locations database on a regular basis via 'Tom Tom Home' (which should be installed on your PC or Laptop). You can download the latest version of Tom Tom Home from the official site.
Without A-GPS and the unit not being in regular use, your unit may take a very long time to find suitable satellite signals. My own TomtOm One, without an up to date a-gps database has taken over 15 minutes to locate the required signals even in a relatively 'open' air location!
Hope it helps and clarify the issue.
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