Go to Amazon Sites : br br Apple PowerBook G4 m5884 Titanium DVI Powerbook G4 15 A1012 M6091 M8511 Laptop Battery - Premium br br Type Li-Ion Voltage148v Capacity4400mAh8 Cells br 1 year replacement warranty30-day refund guarantee after the purchase br High Capacity Replacement battery br Each Superb Choice battery was tested at an original laptop by the manufacturer