With an appropriate plug adaptor, should I be able to charge a sony (HD-5) without any major probs on foreign electricity systems - thinking of N America and Australasia? Or will a player purchased in the UK only function properly on a 220v/50hz system? If it will work, would it affect that battery life span? also, my PC lacks USB 2.0 - do the sony players work with the old style USB 1.1 - their web site appeared to contradict itself! Many thanks for any advice.