truCELL Premium Replacement Laptop Battery for Sony VGP-BPS13, VGP-BPS21, VGP-BPL21 Battery Models ***Includes Mouse Pad *** Replaces Sony battery models VGP-BPS13 , VGP-BPS13/B , VGP-BPS13A , VGP-BPS13A/B , VGP-BPS13B , VGP-BPS13B/B , VGP-BPS21 , VGP-BPS21A , VGP-BPS21A/B , VGP-BPS21B , VGP-BPS21B/B , VGP-BPL21 Specifications: Chemistry - Lithium-Ion, Capacity - 4400 mAh, Voltage - 10.8 Volts Rechargeable - No Memory Effect ; Utilizes BSP Technology for Surge & Overload Protection; Guards Against Short Circuits Utilizes BSP Technology for Surge & Overload Protection, Thermal-Cut-Off; Guards Against Short Circuits QUALITY GUARANTEED - Industry Leading 3 Year Manufacturer's Warranty