Includes one 5200mAh Li-ion battery, cleans up to 180 mins per charge. Quickly and easily install the replacement battery. Rest assured that these are genuine eufy RoboVac accessories. Maintain your RoboVac's peak cleaning performance by replacing parts when necessary. Compatible with RoboVac X8 Series. Packed with a host of features, it scores high on the aspect of functionality. The fact that it ensures a seamless user-interface makes it worth the buy.