Laptop Replacement Battery for select Sony Laptop / Notebook / Compatible with SONY VGP-BPS13/S, VGP-BPS13A/S, VGP-BPS13AS, VGP-BPS13B/S, VGP-BPS13S, BPS13S, BPS13AS, BPS13BS, BPS13 ( 6 Cells, 4400 mAh ) - Includes Soft Nonporous Microfiber Cleaning Cloth Includes Soft Nonporous Microfiber Cleaning Cloth and ONE Compatible Laptop Battery 18 Months Manufacturer Warranty, 100% Compatible Non-OEM : Lithium Ion (Li- ion) Long Life Battery: Rechargable with No Memory Effect and Power Surge Protection. 4400 mAh Capacity, 11.1 Volts. Includes CD disc for modifying Sony BIOS program on the computer. Please note that BIOS for Sony must be modified before compatible battery can be used. Protective Retail Packaging, Each Product is Sealed with Anti-Static Shield Sleeve. Exclusive Offering of High Performance, Long Lasting, and Durable Grade A Cell Battery