Features: 1. High quality Robotic Vacuum Cleaner Replacement Battery for Robot Vacuum Cleaner S50/S51/S55. 2.5200mAh 6500mAh Large capacity, rechargeble battery. No for gap shaking, safety secure. 3.Robotic Vacuum Cleaner Replacement Battery is high quality. It is made of high-strength materials. Long for time service. 4.The accessories parts are durable and easy to install, helping your vacuum cleaner working longer. 5.Essential and neccesory accessories of Robot Vacuum Cleaner S50/S51/S55. Specifications: Item: Battery for Robot Vacuum Cleaner S50; S51; S55 Cells Type: Lithium Voltage:14.4V Color: Red ( as picture shown ) Battery Capacity:5200mAh 6500mAh Size: Approx. 13.7x4.4x4.5cm/5.39x1.73x1.77in Weight: Approx. 400g Note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Piece Vacuum Cleaner Replacement Battery