Sony PCGA-BPZ51 replacement laptop battery by Amstron is made from the highest quality cells and parts. Amstron provides reliable, high performance replacement batteries for your Sony laptops. The LSO-14 is designed to be 100% manufacturer compatible with Sony OEM part numbers PCGA-BP2R, PCGA-BPZ51, and PCGA-BPZ51A. This precision-engineered battery is designed for use in the Sony Vaio PCG-R505 and PCG-Z505 series of Sony notebooks. • Full 1 year warranty