Makita PDC01 ConnectX/LXT/LXT/X2/XGT Portable Backpack Power Supply is a portable power supply unit. The backpack utilizes four lithium-ion batteries to provide 4x the run time when used with Makita® 18V LXT® Cordless Products and double the run time when used with Makita® 18V X2 LXT® Cordless Products. The battery box can be detached from the harness for use as a stationary power supply. The backpack is connector cord compatible with the 18V LXT® Adapter or 18V X2 LXT® Adapter (191A53-7 and 191A52-9, sold separately).