Hiport Laptop Battery For Gateway M500, M500B1, M505, M505B2, 529249, 40003013, 6500768, 6500855, BTP-51B3, BTP-68B3, 4UR18650F-2-ACR-AJ Laptop Notebook Computers Cells: 8 Cells Volts: 14.8V Capacity: 4000mAh; 59Wh