Balance connector with FEMALE housing, 100mm leads - For 2S-4S Lipoly Packs. These are the connectors that MATE to PolyQuest, E-Tec, and Hyperion Lithium Battery Packs. Use them to wire up a board with metal tabs, so that you can easily check the individual cell voltages within your pack with a voltmeter. You could also use these with HP-LBAMC-P4 to make a 2S, 3S, or 4S balance plug extension.