The Sony VAIO PCGA-BP2NX LITHIUM-ION Battery Pack is a high-quality battery designed specifically for Sony laptops. With a capacity of 4000 mAh and a voltage of 14.8 V, this Li-Ion battery pack is perfect for keeping your laptop powered up for extended periods of time. Made in Japan, this black battery pack is compatible with the PCGA-BP2NX and VAIO product lines, ensuring a reliable fit for your Sony laptop.