This connectors allow two 3s LiPo packs of the same capacity and type, to be charged through a single 6S Charger lead.  It has two female 3S JST-XH connectors on one side, and a single 6S JST-XH male on the other.

This product is intended for experienced users and should only be used when parallel charging two 3S LiPo packs of exactly the same specifications.