The Lenovo 42T4235 Battery Replacement is a high-quality laptop battery designed specifically for Lenovo models such as ThinkPad E40, E50, L410, SL410, and SL510. With a battery capacity of 57WH and a voltage of 10.8V, this Li-Ion battery provides reliable power for your laptop, ensuring extended usage and performance. The black color and sleek design make it both functional and stylish, while the compatibility with various Lenovo models and product lines ensures a seamless fit and compatibility. Made in China, this battery is a reliable and efficient replacement for your Lenovo laptop.