Just received my nice new Pronto, however I find it does not work. :(

Following instructions I put the battery in and got no beeps or anything, so I thought flat battery as it came in from the USA to Australia, so I plugged in an appropriate charger (it came with a 110v plugpack), and left it plugged in for half an hour (I figured long enough to see it at least come to life for a short time), but still nothing.

Checked the battery voltage and it's sitting around 4.5v , so it's close enough to the 4.8v that's marked on the pack, so it's not the batteries.

I'm guessing I've either missed something, or it is DOA, so before I send it back I thought I should ask in here first. :)