These parts are in no way associated with the initial manufacturers parts. Compatible with the battery part numbers:21-61261-01, 21-65587-01, 21-65587-02, 21-65587-03, 82-111734-01, BRTY-MC90SAB00-01, BTRY-MC90GKAB0E-10, KT-21-61261, KT-21-61261-01.