This power cable can one end has Two 5.5 x 2.5mm male connectors, another end has one 5.5 x 2.5mm male connector.
You may use this cable to connect two BiXPower BP90 batteries, or two BP100 batteries, or two BP160, or two BP220 batteries in parallel to provide more running time. Please make sure two batteries output voltage are set as same when link two batteries together.
Batteries Not Included
These BiXPower batteries ( such as BP90, BP100, BP160 and BP220 batteries) have special designed circuits inside to allow multi batteries connected in parallel when output voltages are set as same. Other lithium ion batteries may not allow to connected in this way.