As is common in Australia, we are in love with outdated transport technologies that lead to overlong journeys at less than 100 km/hour / 62.5 miles/hour (in this case more like 60 km/hour / 37.5 miles/hour). Apparently the larger the country, the slower everything has to be..
As is the case with a planned rail/coach trip I'll be taking soon

14 hours of listening to the sound of a train and coach while reading with my Sony Reader!
I'm hoping the battery will hold out, but if it doesn't I definitely won't have access to a power outlet - even if I did, the only outlets on board the trains would be subject to power surges and would fry my PRS-500!

Can anyone recommend a 'external battery' device, somewhat like what they sell for mobile phones now, that will work with a PRS-500?
I guess it would have been designed for a PSP but I have yet to see one.