Synergy Digital Vacuum Cleaner Battery, Compatible with Candy Hoover RBC004B011 Robo Vacuum Cleaner, (Ni-MH, 14.4V, 3500mAh) Ultra High Capacity, Replacement for Hoover RB201 Battery Specifications: Battery Chemstry: Ni-MH Voltage: 14.4V Capacity: 3500mAh Compatible with: Hoover RB201 Battery Works for: Candy Hoover RBC004B011 Robo Vacuum Cleaner and many more