NEW OEM HP HSTNN-Q44C PART # 572831-121 LAPTOP BATTERY FOR Mini 311c-1000 Series Type: Li-Ion Voltage: 10.9v Capacity: 4400 mAh; 6 cells; 1 year replacement warranty,30-day refund guarantee after the purchase. High Capacity Replacement battery High capacity battery certified by CE and RoHS, This battery was tested and proven to match and/or exceed original specifications of HP products. Each Superb Choice battery was tested at an original laptop by the manufacturer.