You might want to try either Harris RC or Ferral next time you buy batteries, they are both australian matchers and no one I know has ever had any problems dealing with either of them and there prices are equal to or better than anything from the overseas.

http://www.harrisrc.com/

http://www.feralbatteries.com.au/

I have some 4300 GP packs from both Harris and Ferral and although not the best cell to begin with they are all still going strong (they are about a year old now)