Battery for Avaya 20DT 4145 4146 7420 7430 7434 7439 7440 7449 INDEX DT20 WT9620 Compatible with the following devices 20DT, 4145, 4146, 7420, 7430, 7434, 7439, 7440, 7449, INDEX DT20, WT9620, NEC 2G4, NORTEL 4135, 4145, 4146, 7420, 7430, 7434, 7439, 7440, 7449, Spectralink 7420, 7420 DECT, 7440, 7440 DECT, 7480, 7480 DECT, 7520, 7522, 7540, 7620, 7640, 7710, 7720, 7740, Spectralink 7520, Polycom DECT 3040, DECT 4020, DECT 4040, DECT 4080, KIRK, KIRK 3040, KIRK 4020, KIRK 4040, KIRK 5020, KIRK 5040, AGFEO DECT 30, DECT C45, Tiptel 500 DECT, P11, T016, AUERSWALD COMFORT, Comfort DECT 800, ELMEG DECT 300, DECT 400, DECT 400-20, DECT 400-40, DECT 800, P11, T016, Telrad, 3040, Kirk 3040, 4020, 4040, 4080, KIR 200903, 3020, 3040, 3340, 4020, 4040, 4080, T-PLUS2, Z3020, Z304, Bosch Atus DE1-BX, Atus DECT 6000, Formerly KIRK 50, KIRK 60, KIRK 70 Compatible with Battery Part Numbers NT7B65KSE6, NT7B65LD, NT7B65LDE6, NTTQ47KAE6 and NT7B80BXE6, NEC CS-NTL743CL, NORTEL NT7B65KL, NT7B65KSE6, NT7B65LD, NT7B65LDE6, NTTQ47KAE6 and NT7B80BXE6, Spectralink 84743411, Polycom 84743411, AH-AAA600F, NT7B65KL, NT7B65LD, AGFEO CS-NTL743CL, Tiptel 84743411, AH-AAA600F, AUERSWALD CS-NTL743CL, ELMEG CS-NTL743CL, Telrad CS-NTL743CL, Kirk CS-NTL743CL, KIR CS-NTL743CL, Bosch CS-NTL743CL, Formerly CS-NTL743CL