The VAIO Standard Capacity Battery for SZ, FE and AR Series Notebooks from Sony is an extended-life battery for SZ and FE series notebook computers. The battery is also fully backwards compatible with the Sony VAIO SZ, FE and AR series of notebooks. Utilizing advanced battery cell technology and high-quality components, the Lithium-Ion battery provides approximately 6-7 hours of life for an SZ notebook and 2-4 hours for an FE notebook. This battery is a great solution for users who need replace their original batter or would simply like a spare.