Amsahr Replacement Battery for Sony VGP-BPS21, S115FG, Y11M1E, Y11S1E, CW2MFX/PU, VGN-AW, BZ31VT 18 Months Manufacturer Warranty, 100% Satisfaction Guaranteed. 100% Compatible Non-OEM : Lithium Ion (Li- ion) Long Life Battery: Rechargeable with No Memory Effect and Power Surge Protection. 6600 mAh, 11.1 Volts & 9 Cell 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 Replacement Laptop Battery for Sony BPS21 Compatible Non-OEM Long Life, Li-ion Battery Rechargeable with No Memory Effect and Power Surge Protection. Exclusive Offering of High Performance, Long Lasting. Durable Grade A Cell Battery.