The BTI notebook battery by Battery Technology is a high-quality power solution for your notebook. Designed specifically to meet the needs of users who require reliable and long-lasting performance, this battery features a 5000 mAh capacity and 57 Wh, ensuring that your device stays powered for longer periods. The use of 3-cell lithium-ion technology not only provides a stable and efficient power source but also ensures safety and durability. With 11.4 V of power, it efficiently operates your notebook, enhancing your productivity and entertainment experience without the constant need for recharging. Furthermore, its compatibility with Dell 66DWX models makes it an ideal replacement or spare battery, offering seamless integration with your device. Whether you're a professional on the move or a student, this notebook battery ensures that your device keeps up with your busy lifestyle.