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Does anyone know why my iRobot Roomba doesn't seem to charge? Didn't use it for a few months.?

When I place it back on base to charge, red charging light starts glowing and then turns green an hour or so later, indicating that it has fully charged. But when I start it, it runs for one second then it stops, and its power button turns red again like it was never charged at all. I tried cleaning the charging contact points to no avail. What could be the problem? When I place it back on base to charge, red charging light starts glowing and then turns green an hour or so later, indicating that it has fully charged. But when I start it, it runs for one second then it stops, and its power button turns red again like it was never charged at all. I tried cleaning the charging contact points to no avail. What could be the problem? ... I already tried to reset the batteries and charged it for 3 days but it's still the same. Power light just turns back to red and makes that discharged tone as soon as I press the clean/max button.

Answer
Reset the Roomba charging system. Do this by removing the Battery and holding down the “power” button for at least 5 seconds. Then reinstall the Battery. 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.) 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. 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.

What's wrong with my Roomba?

I have an iRobot Roomba that is less than 2 years old. (Pretty basic model.) Recently it no longer wants to run. At first it would run for 30-60 sec then stop and give me a tone. Now its just giving me the tone as soon as I hit clean. The tone sounds unfamiliar to me (not the normal "uh oh" tone) - the tone is low-high-high-low. There are no beeps after the tone plays. The clean light is green until it gives me the tone then it blinks red. I have cleaned out the brushes and emptied the bin and the filter part. The wheels seem fine. I really cannot determine what could be wrong. Does anyone have any ideas or has experienced anything like this? I have checked the manual that came with it. Like I said in the original post - the tone is not the normal "uh-oh" tone which I have experienced in the past & have been able to diagnose and there are no beeps after the tone.

Answer
My next guess would be the battery, they are not cheap, do you have a vacuum repair place nearby? Good chance they will have batteries or maybe even let you try one. The manual is available at their site and it explains what the beeps mean. http://homesupport.irobot.com/cgi-bin/irobot_homesupport.cfg/php/enduser/home.php?clear_cookie=1