The 14.4V 3500mAh Battery for Irobot Roomba 500 5/6/7/8/9 Series of floor sweepers is a high-quality replacement battery designed specifically for the Roomba 500 model. With a Li-Ion battery type and a capacity of 3500mAh, this black battery ensures long-lasting power for your floor sweeper. Compatible with brands like Acer and HP, this battery is a reliable choice for keeping your Roomba in top operating condition. Made in China, this battery meets the standards of quality and performance you expect for your robotic vacuum cleaner.