The PA-BT-4000LI is a long life, compact Li-ion rechargeable battery pack (requires optional battery base unit PA-BB-001 for TD-2xxx and PA-BB-002 for PT-Pxx to be preinstalled to each printer). Compatible for the Brother models RJ-4030, RJ-4040, TD-2120N, TD-2130N, TD-2130NHC, PT-P900W, PT-P950NW printers and the PT-D800W label maker.