Amsahr Replacement Battery for HP / Compaq 4210S, 4310s, 4311s, 530975-341, 579320-001, AT902AA, HSTNN-DB91 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. 4400 mAh, 14.4 Volts & 8 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 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. 4400 mAh, 14.4 Volts & 8 Cell Protective Retail Packaging, Each Product is Sealed with Anti-Static Shield Sleeve. Replacement Laptop Battery for HP 4210S Non-OEM Battery 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.