This is an authentic and brand new battery from Toshiba, model numbers PA3786U-1BRS, PA3787U-1BRS, and PA3788U-1BRS. It is specifically designed for use with Toshiba laptops and netbooks. With this battery, you can keep your device powered up and running smoothly for longer periods of time without having to constantly worry about recharging. It is a genuine product, ensuring that you can trust its quality and reliability. Whether you're looking for a replacement battery or simply want to have a backup on hand, this Toshiba battery is an excellent choice. It is compatible with a range of Toshiba laptop models, and will provide reliable, long-lasting power to keep your device functioning optimally.