The SI-B8U095260WW is a 4 cell, 3930mAh, 7.4V lithium ion battery made by Samsung. It is a compatible replacement for a wide range of Samsung laptops including the 300E4A, 300E5A, NP300E4C, NP300E5A, RV511, and Series 3 models. All products have undergone testing before leaving the factory to ensure they meet the necessary safety and performance standards.