The Toshiba PA3817U-1BRS 4400 mAh Laptop Battery in black is a high-quality replacement battery designed specifically for Toshiba laptops. With a capacity of 4400 mAh and a voltage of 10.8V, this Li-Ion battery provides long-lasting power for your device. It is compatible with various Toshiba satellite, portege, libretto, and satellite pro models, making it a versatile and reliable choice for your laptop needs. With dimensions of 2.70 x 9.40 x 7.50 inches, this battery is a convenient and essential accessory for on-the-go productivity.