The iRobot Roomba is a miniature robotic vacuum cleaner. Some Roombas experience a battery charging problem. In these situations, the battery power cycle may be shortened or nonexistent. The manufacturer of the Roomba has determined a fix to this problem: resetting the battery. In most situations, resetting the battery solves the intermittent power cycle problem and restores your Roomba to its original operating state.
Turn the "Power" switch off and flip your Roomba over, exposing its bottom.
Depress the tabs on each side of the battery pack; lift the battery pack from the Roomba.
Press and hold the "Power" button for five to 10 seconds.
Reinsert the battery into the Roomba. Push the battery tabs down to secure the battery.
Connect your wall outlet charger to your Roomba. Let the battery charge for 72 hours.