Wireless GPS- Any one using one?

I had one of the older 'wired' types . . . could never find a cable long enough to hook it up though (a little over 66 million feet) . . . :lol:
This line causes some concern:
  • Battery Life: 8 hours (charge up to 500 times)
What happens after the 500th charge? Do you just throw it away? I didn't see where it had removable batteries.

Edit: typo
I've been using their Earthmate for years (serial port) and just got the LT-20 USB version with Street Atlas USA 2007 and am happy with it . Bundle is $99.95.

Being USB, I have no battery issues. I love the VR capability. Speak. "where am I?", for example.