If bObi's cleaning cycles are much shorter than usual, you may need to replace her battery.
First, make sure bObi's side power switch is turned OFF.
Next, flip bObi over onto a flat surface. Remove the two screws holding bObi's battery cover in place.
Lift bObi's battery out of its compartment by the white tabs on either side of it.
Then, disconnect the battery by pulling at the circuit junction.
Reconnect the new battery at the circuit junction and tuck the wire into the side of the battery compartment.
When done, replace bObi's battery cover so that it lays flat. Then reinstall the battery cover's two screws.