Most of the other brand phones have the feature of charging the battery via USB cable. When it comes to Nokia 5800 it hasn’t got this feature. When I had a Sony w810 mobile I would use the data cable to charge my mobile and also to transfer the files. But surprised to see that the Nokia 5800 XM has not got this facility. I went on to search for something that could help me connect my phone to my laptop to charge the phone. Finally came to know that Nokia has got something called USB port CA-100, a separate accessory to charge you phone by connecting it to PC or Laptop. This accessory costs around $20 and is available in Amazon.