Hi Andy
I had a problem with my TomTom last week. I updated the software when I Connected it to my PC. After it updated itself it would not let me use it.
If you Google TomTom you will find a Help and repair Tel No. I think it was an 0845 Numbe,. Phoning the No i got through to there help/repair desk. (in Amsterdam) having fixed my software problen, I asked if they could replace the battery and where/ how much approx. £25 pounds plus P/P. seams like good value but I did not ask were I would need to send it ! (fool I am)
Regards
Dave