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Sometimes the contacts between the battery and the iRobot get corroded...you can try using a small piece of sandpaper to lightly scuff/clean the battery contacts. Once you put it back together, try the reset function mentioned previously.
It is possible for the charging system inside the roomba to call it quits. What I did to remedy this, since my roomba was out of warranty and I did not want to scrap it, was to buy a charging base on ebay. This charging base accepts different types of roomba batteries and even the scooba battery. The inconvenience is if you have a newer model roomba that has the battery inside, then you will need to remove the screws on the bottom plate to remove the battery. Hope this helps.
I had the same issue, then i just found the manual, in charging part, it says:"The charging indicator will be lit as long as the appliance is connected to the plugged-in charger." Also it says:"While charging, the charger may get warm, this is perfectly normal and safe. It can remain on charge indefinitely without damage or danger. It is not possible to "overcharge" the battery cells with the charger provided"
You have to do is: Check the battery if it is leak.Use a voltmeter to test the output voltage of the battery.If your battery had a low supply voltage even you charge it for 3 hours and above.Replace the battery immediately.
Try running the battery all the way down by letting the vacume run in a corner or another room and even when it stops leave it on for a hour to drain the battery. Then shut the switch off and try charging the battery. Make sure the charger is putting out enough volts by looking at the rated output of the charger and while it is plugged in check it with a volt meter. If it does not hold a charge and the charger is putting out the right voltage you need to purchase a new battery for the vacume
This is totally happening to me too. It apears to charges, works for about 2 minutes then stops and the red light is on as if its not charged. I am thinking to buy a new battery but they seem to be about AUD$50 and if thats not the problems I have wasted my money. The repair centre in Melbourne was so rude on the phone I wont send it to them as they cannot say how much it will cost me
Reset the Roomba: hold down "spot" and "dock/demo" for fifteen seconds, then release and listen for the tune. Then charge the Roomba overnight. The next time you run it, the unit should run longer. If not, call support and let them know you may have a battery problem. 1-877-855-8593 (I strongly encourage you to have the Roomba with you if you call.)