What's the name for this connector?
http://www.rcgroups.com/forums/showthread.php?t=2011982 

That link has them talking about the proper PN for the Walkera connector (which is what you seem to have).

Here is a picture of the Walkera/Loku part that matches yours:


The part you have is equivalent to Molex PN 0510050200. You need Molex PN 51006-0200. Or you could buy the Walkera male part if you want to stick with that RC brand.

In case you're interested in how I got my answer, I googled "rc battery connector" and one of the first images had the Walkera connector. Visited the page for the name and went from there.