This is a Black Plastic Storage Box Case Holder for Battery 3 x 18650 Cell Box, without Cover.
 
The case box can keep your batteries organized and protected. The holder case is designed with leads for easy to solder and connect. This battery holder case is perfect for the devices need an 11.1V external battery.
 
This Battery Holder is compatible with our 18650 Li-ION Batteries which you need to buy separately.