These batteries are specifically designed and built for the apple powerbook g4 series G4 Series (Gigabit Ethernet) With a longer power lasting time and quick time to be fully charged, the battery gives you the best performance possible compared to original manufacturer standards for apple powerbook g4 series G4 Series (Gigabit Ethernet) Batteries; even it delivers 5% more power than the original apple powerbook g4 series G4 Series (Gigabit Ethernet) Battery.