TomTom Nav 3 Bluetooth GPS charging problem?

I have the above unit but Im confused by the colouring of the LEDs on the front.( didnt seem to have any instructions in the box for the reciever)

When I use the incar charger I get a red led which occasionally flashes yellow.

Is this right for charging ? Im worried that its not charging properly

thanks

Andy

[Charlie]

Welcome to our forums.
Blue = Bluetooth signal, Green = GPS signal, RED = battery flat, RED + Green/Yellow = charging.