Simply remove the two screws on the bottom, remove the battery connector and plug in the new one. Then revive your robot.
LabTEC 14.4V 4000mAh Replacement Battery for i7, Li-ion Battery for iRobot Roomba 7150 7550 3150 3550 4150 4552 i4 i4+ i3 i3+ i7158 i7550 i755020 4624864 ABL-D1 Hoover
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