The Panasonic CF-VZSU1428W Second Battery is a high-quality Li-Ion battery designed specifically for the Panasonic CF28 Toughbook. With a battery capacity of 3.8 Ah, this secondary battery is ideal for extending the runtime of your Toughbook while on the go. Compatible with the Toughbook product line, this Panasonic battery ensures reliable performance and long-lasting power for your laptop. Ideal for professionals who need a reliable and efficient power source for their Panasonic Toughbook.