Replacement battery fits 16 EXFO compatible models. Specifications: 10000mAh, 3.7V, Li-Polymer. Compatible with: MAX-700, MAX-900, MAX-900FIP, MAX-700B/C, MAX-900-iCERT, MAX-FIP and 10 more compatible models. Replaces: EXFO GP-2209, EXFO 880X266, EXFO 01WQ0037-02. EXFO replacement battery designed for Equipment/Survey/Test Charger devices. Ensures your device stays powered through regular use.