SONY VGP-BPS3A Additional Standard Battery Extend battery life when traveling. Provides up to 4 to 9 hours of battery life (depending on use) Power: (7.4V/7560mAh) Weight: 0.74 pounds Dimensions: 8.1inches (W) x 1.2 inches(H) x 1.6 inches(L) Perfect for lengthy meetings or flights