My brother has a 14" iBook G4. He's completely computer illiterate and has asked me, the admitted computer geek, for help with his battery life. He takes frequent trips to Thailand and is looking for a battery for his computer that will last the entire 12 hour flight. He says his coach seat does not usually have a power outlet at his seat and the only way will be a battery. Does anyone know if an internal or external aftermarket battery that would provide power for an extended period of time? thanks!