The Replacement HP HSTNN-DB8J Battery 933321-855 932823-421 is a high-quality lithium-ion battery designed for HP EliteBook laptops. With a capacity of 4330mAh and 50Wh, this battery is compatible with models such as 830, 840, 735, and 745 G5 G6. The battery is black in colour and comes as a single unit, making it a reliable and efficient choice for those in need of a replacement for their HP laptop battery.