look at the charger drive belt(s), if it's two thin v-belts on a smooth pulley then it's standard. If it's a wider toothed belt which looks like a cam belt then it has a toothed belt conversion.
It's a bit hard for anyone to diagnose what a random noise might be but if it's from the charger area then I'd be careful. If everything around there seems tight and nothing clearly rattling around then remove the charger. See if you can rotate it easily and if you can hear anything. Then to be honest, you'll need to send it off somewhere. G-Werks or Jabbasport would be the best places.