Type: Li-ion Cell Voltage: 10.8V Capacity: 3500mAh Item Weight: 240g per battery with package Replace: Dremel 855-02 Fit for: Dremel 8000-01, 8001-02 Note: It's recommended that the battery should be fully charged and discharged 3 times after you receive the battery. For transport safety, our batteries are not fully charged before leave the factory. After use, please charge the battery after cooling. Package Includes: 2x 10.8V 3500mAh Li-ion Battery For Dremel 855-01 855-02 855-45 8000-01 8001-01/02.