The PCGA-BP1N is the same as the PCGA-BP71 except that the PCGA-BP71 is the one that shipped with most Sony laptops. The Battery is lighter in weight by about 50% . Compatible Part Numbers: PCGA-BP71, PCGA-BP71A or PCGA-BP1N.
Battery Specs: Li-Ion, 14.8 Volts 1700mAh. It is important to have reliable and flexible back-up options while on the road, or at home. Extend the life of your VAIO Notebook by placing a second Battery in the versatile drive bay that you can recharge and keep ready while you’re on the road. Sony provides high quality accessories for demanding mobile users. This Battery can be used as a primary Battery (Replaces the one that is damage) Or it can be used on the bay in that way you get double the power and time.

Impact Computers Brand, See Also PCGA-BP1N