Iwasgoodonce":2tj91ehe said:I'm planning on not seeing electrickery, let alone a USB port for long enough to see off even the longest lasting lithium rechargeable. Just really like the idea of changing a battery when needed. Also if the life of the whole thing is dependant on a battery? The battery in my Navman lasted not long enough to my mind. If it had been a true mobile device I would be narked to say the least!