Use this type XT60 connector for connecting two identical Lipo batteries in series to effectively double the total voltage and cell count. Use this to construct a larger voltage pack out of two matching smaller packs. This connector comes with two male and one female connector which is design to connect two batteries in series connection to provide you combine double voltage from both batteries at the harness output end female connector.
For example, if you connect two 11.1v 2200 mah Lipo batteries together with this harness, you end up with a 22.2v 2200 mah battery. This is a great way to make use of your smaller Lipos in large models, saving the cost of purchasing large-capacity Lipos that can only be used in large models.
Best one …running two motors from same battery