Lithium-Ion batteries are long lived than conventional batteries and do not require replacement as often. The Dell™ 9-Cell Smart Lithium-Ion Primary Battery has internal circuit board with chips that allow it to communicate with the Laptop to monitor battery performance, output voltage and temperature. It also gives the Laptop accurate 'fuel gauge' capability to determine how much battery runtime is left before the next recharge is required. This product has been tested and validated on Dell systems. It is supported by Dell Technical Support when used with a Dell system.