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Switch it on and let it totally discharge - the battery could have established a memory and thinks that it is fully charged -the wonderful world of electronics where nothing is what it seems.
Once discharged put it to OFF position and recahrge it.
Wiring diagram pinout for Navigon GPS charge and concurrent use
5 Volts Direct Current
Conneted to Pin 4 (GND) as pure short, no resistor
Ground, shorted to pin "X"
Use of standard mini-b will place unit in
Data Exchange/Synchronization mode. Use of mini-b with a 4-x pure short
will allow use of Navigation software and concurrent charging. USB power
source must be 1000 ma or above.
The problem lies with the fact that a standard mini usb pin-out has + voltage on pin 1 and ground on pin 5. The navigon is programmed to recognize this as a computer. The navigon charger however has + voltage on pin 4 and ground on pin 5. The reason for navigon doing this as opposed to following the standard pin-out is due to the unit requiring a stronger power supply to charge the battery. USB current output on a computer does not have the capacity to do this. As a consequence, you will have to find a charger that has the right pin-out for this device ( + on pin 4 and - on pin 5 ). The tough thing is, there is no way to tell one from the other, they look identical. However, I have found that chargers with a capacity of 1000 ma or greater are pinned-out like above ( + on pin 4 and - on pin 5 ). Other than using a multimeter to verify the pins, the only thing to do, would be to plug it in and see if it works. Hope this helps.