Replacement battery fits 8 Cardioline compatible models. Specifications: 1800mAh, 3.7V, Li-ion. Compatible with: Seca CT321 ECG Machine, Maico easyTymp, Maico Interacoustics Titan, Maico Interacoustics TCallisto, ECG100, ECG100+ and 2 more compatible models. Replaces: Maico MAI-721-4, Maico 74101501, Otometrics 8-73-02400, Otometrics 1770-9672. Cardioline replacement battery designed for Medica…