This is a high-quality "4200mAh - Li-ion - 25.2V" vacuum cleaner replacement battery. With an 80% performance guarantee of the original capacity for 12 months. Savvy incorporation of grade "A" battery cells enhances the performance of the battery, making it as good as the original ones. The high-impact ABS and polycarbonate plastic provides immense strength and stability to the battery, making it highly durable. The battery is meticulously manufactured according to the provided specification of manufactures, which makes these batteries completely align with the products. This is a High-Quality Replacement Battery for Original Vacuum Cleaners. It has 100% Compatibility and Technical Characteristics that are Equivalent or Superior to OEMs! This Dyson 970145-02 Replacement Battery contains Advanced Technical Components and has been Tested according to the Strict Standards of CE Safety.