Your Roomba may be experiencing an issue where the APS Battery is deeply discharged and may need to charge longer than the standard 2.5 hours. (or 6 hours if you have a standard charger) If you have fully charged your battery (the Roomba power light is solid green) and its charging time was short (less than 20 minutes) and its run time was short (less than 20 minutes) you will need to do the following.
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Reset the Roomba charging system. Do this by removing the Battery and holding down the “power” button for at least 15 seconds. Then reinstall the battery.
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Plug the charger into Roomba (avoid using the home base if you have one so as to ensure the Roomba’s charging cycle is not interrupted).
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Charge the battery until the Roomba power light is solid green and keep the Roomba on the charger for an additional 72 hours (3 days). Note: Do not interrupt this charging cycle.
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In Max mode, run the Roomba for one complete cycle without a home base present, to deplete the battery. Keep track of the runtime and if it has improved, repeat steps 3 and 4 a few times. If your Roomba does not have Max mode, run several Clean cycles until Roomba stops and plays the “dead battery” song.
If this procedure does not work, it may be worth considering the purchase of a new Roomba APS Battery.