Tandy or dick smith usually have a selection of those batteries in stock.
For a charger I'm pretty sure you'd be able to chase down some sort of
240 vl unit locally like this one.
http://www.master-instruments.com.au...ory_Leads/1347
My pretty limited experiance with those small sealed l/a batteries is that they don't take well at all to overcharging (killed mine very quickly )so some sort of smart charger like the one above would be a wise investment.
The plugs you have there are fairly standard looking and you should be able to grab something off the shelf to suit.