This is a generic, equivalent one, 100% compatible
Equivalent battery fits the following iRobot vacuum cleaners:
Roomba 4000 4100 4105 4110 4130 4150 4160 4162 4170 4188 series

Replaces iRobot battery part numbers: 4978, 17373, 40901

Specifications:

• Brand: generic/equivalent
• Condition: new, 1 year warranty!
• Voltage: 14.4V
• Capacity: 2500mAh
• Battery Type: Ni-Cd
• Dimensions: 173.40 x 51.10 x 52.70 (mm)