http://www2.towerhobbies.com/cgi-bin...?&I=LXDZ42&P=7
This is all you really need. 5200 mah of capacity. Verifies if plug is good. Relatively compact.
Remember, it is only the voltage you need to be warry of. If you go much over 1.5V you will pop the plug. You can connect to a 1,000,000 mah source with no issues (as long as it is 1.5V or less).