Replacement battery fits 5 PCE Instruments compatible models. Specifications: 3500mAh, 3.7V, Li-Polymer. Compatible with: Colorimeter PCE-CSM 10, Colorimeter PCE-CSM 3, Colorimeter PCE-CSM 6, Colorimeter PCE-CSM 7, Colorimeter PCE-CSM 8. Replaces: PCE Instruments BQ021, PCE Instruments PCE-CSM-BAT. PCE Instruments replacement battery designed for Equipment/Survey/Test Charger devices.