I had an iQue3600 for 2.5 years and my battery finally just would not hold a charge. I tried to change the battery that is internal, but I failed to complete the job. I used it so much and I got great use out of it but it finally died and I gave it a crushing farewell. I have ALL sorts of accessories that the iQue3600 will use; like 2 car cradles with the voice speaker, an external batter pack that you can connect to it via the pin-hole power in the bottom of the unit, an extra PC USB cradle for loading maps into it and charging up the internal battery in your house. I would be willing to sell ALL these needed accessories for a fair price if you are anyone needs it for their iQue3600. I replaced my unit with a 60Cx because of the death of my iQue3600 that was well used for years! I plan on doing more outdoor stuff, like riding my motorcycle with my new 60Cx. The other folks are correct when they say the iQue is mostly for desktop and car use.