ARB Battery fit for Replacement Hp Compaq 6820s Battery. This ARB replacement battery is made from high grade cells and highest quality parts. This ARB brand replacement battery is 100 percent comparable to original battery in all terms including its size, appearance and most important quality. Each ARB laptop battery has to pass strict quality control procedures including filtration and safety testing of voltage, capacity and battery core (body). Each battery also passes necessary authentication certifications like CE, ROHS etc. Before leaving the factory, so you can be rest assured for its quality, durability and performance. Battery part no. model may not be printed on battery Label.