Replacement battery packs for various aligners. Supertracker suggests replacing your batteries after a number of years use.
BP (5 cell) - Laser Aligners
BP4 (4 cell) - Hoffman 1000/STR200 rear scales
BP6 (6 cell) - STR400R
BP8 (8 cell) - STR200
BPL (Lithium Battery Pack) - STR210/410 & STR220/420