This SONY VAIO F640, F650 Series CR2025 Size Lithium Coin Cell is 100% compatable with the CR2025 SONY VAIO F640, F650 Series CR2025 Size Lithium Coin Cell. Our batteries and accessories are made with high quality parts and are guaranteed to meet or exceed the original equipment manufacturers specifications at a reduced price. All batteries are tested for 100% quality control assurance. This SONY VAIO F640, F650 Series CR2025 Size Lithium Coin Cell includes a warranty to guarantee that it has no manufacturing defects.