High Compatibility: This RR03XL battery is compatible with a variety of laptop models (Listed in descriptions below), ensuring a perfect fit and reliable performance. Multiple Part Numbers: Compatible with part numbers 851477-421, 851477-541, 851477-831, 851477-832, offering more options for replacement. Quality Assurance: Manufactured with high-quality materials and advanced technology to provide stable power supply and long battery life. Easy Installation: Designed for easy installation, allowing users to replace the battery quickly and conveniently without professional help. Excellent After-Sales Service: We provide excellent after-sales service to ensure that customers have a good shopping experience. Any questions or problems, please feel free to contact us. The RR03XL laptop battery is a high-quality replacement battery designed to meet the power needs of your laptop. It is compatible with multiple part numbers, including 851477-421, 851477-541, 851477-831, and 851477-832. This wide compatibility makes it suitable for a variety of laptop models, providing you with a convenient and reliable power solution. Manufactured with strict quality control standards, this battery uses high-quality cells and advanced manufacturing processes to ensure stable performance and long-term durability. It can provide sufficient power to keep your laptop running smoothly, reducing the frequency of charging and improving your work and entertainment efficiency. The installation of the RR03XL battery is very simple. With its user-friendly design, you can easily replace the old or damaged battery without the need for professional tools or skills. This allows you to quickly restore the normal use of your laptop and get back to your daily activities. In addition, we offer excellent after-sales service. If you have any questions or concerns about our product, our professional customer service team is always ready to assist you. We strive to provide you with the best shopping experience and ensure that you are satisfied with our product. ? Technical Specifications: ? Battery Type: Li-ion | Voltage: 11.1V | Capacity: 48Wh/3200mAh ? Cycle Life: ?500 cycles | Operating Temp: 0?~45? ?Compatibility List: Compatible with Laptop Models: Hp ProBook 430 G4 440 G4 450 G4 455 G4 470 G4, HP ProBook 440 G5 450 G5 470 G5 Series Notebook Replacement for Battery Part Numbers: RR03XL, RR03048XL, HSTNN-PB6W, HSTNN-LB7I, HSTNN-UB7C, HSTNN-Q01C, HSTNN-Q02C, HSTNN-Q03C, HSTNN-Q04C, HSTNN-Q06C, 851477-421, 851477-541, 851477-831, 851477-832, 851610-850, 851610-855 ? Usage Tips: First use: Fully charge for 8-12 hours to activate cells Store at 50% charge if unused for 3 months Use original HP charger for optimal performance