Thanks for the replies so far.
Just to confirm this is a 505, not a 500, and the understanding is that the 505 probably should work except when charging from fully discharged.
On my initial charge the device was not fully flat (but ended up that way
).
One of the reasons I want to know is to determine how feasible it is to take the 505 on extended trip without a laptop (e.g. using a Solio or other USB charger).
Thanks again...