SM-ENERGY SM201-6 BATTERY 11.1V 4.2AH 47WH LI-ION Use for EXFO FTB-100,FTB-300,FTB-400 OTDR ,WWG/Acterna/JDSU MTS-5000, MTS-5100E, MTS-5200 OTDR, Anristu MT9082, MT9083,MT9085 OTDR.