Sony VAIO Rechargeable Battery Pack (PCGA-BP2V) Extend the life of your VAIO notebook with a second battery Power: 48.84 Wh (11.1V/4,400mAh) Dimensions (W x H x D): 8 x 1 x 2 Weight: 0.73 lbs Provides up to 3.5 additional hours while you're on the road