What fidspeed said.
Some batteries have a jst style balance connector (the white plug you mention) as well as the main power connectors.
Other batteries just have the main power connectors (normally 4mm bullet type) and a 2mm balance connector.
If you go back to the web page I linked to and set it up for a 2S battery with balance connector, this is the set up with the extra white connector (you'll notice the two wires going into that connector connect at both ends of the battery where the main power wires go in, with the third in the middle). If you have a 2mm bullet type, the 2mm bullet replaces the middle wire of the three wires.
I can't think of another way to explain it. Sorry.
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