ASUS B31N1631 Laptop Battery for VivoBook 15 A505 A505BA A505BP A505ZA F505 F505BA F505BP F505ZA S505 S505BA S505BP S505ZA X505 X505BA X505BP X505ZA R504 R504BA R504BP R504ZA K505 K505ZA 4 Cell Laptop Battery