[edit: not pertinent] I bought two cheap internal SIDO batteries, Charger, and Retractable USB-Nokia cable from Ebay. The batteries have less life than the one that comes with Nokia, but the USB-Nokia charger does work just fine.

FYI, I just found out you can't fly with spare batteries in checked luggage, you must carry them with you on-board. You might not be able to fly with the expensive external batteries mentioned above at all. That's the USA for you.