The battery has probably been drained too far. I have had this work with cordless drill batteries. Plug the charger with the battery in to a power bar. Turn off and on the power bar until the battery starts to charge. This is if you are out of warranty.
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Red = flashing 1 to 10 times means needs a new body
Red -= flashing 11 or more times means needs a new battery
SOURCE: Scooba 5800 Power button Red Blinking
You probably have the manual, but here's the link to the Scooba 5800 manual anyway - just in case this would be useful to you: --> http://www.irobot.com/images/homesupport/5800_Scooba_Manual.pdf You could use a voltmeter to check the battery, but only a few months use shouldn't be enough to wear it out. If you don't have a load-tester to verify the battery's load-capacity, then you can check the voltage drop. (Assuming you can get it to contact the Scooba's circuits.) To do this, just check the battery voltage, apply a load by inserting it in the machine and turning it on, then check the battery voltage again. An excessive drop in voltage may indicate the battery needs replacing. However, the red blinking light is Scooba's indicator that it doesn't detect the battery at all. The first thing to do in this case is to clean the electrical contacts on the battery and in the Scooba. Use a damp cloth and a bit of toothpaste to rub the contacts clean on the battery and in the machine. (Toothpaste has mild abrasives in it and will clean the electric contacts without damaging them.) Make sure that both the battery and the Scooba are clean and dry before re-inserting the battery. Also, if the electric contacts in the machine are flexible matal tabs then verify that the tabs are standing up high enough to make good contact with the battery contacts. Hopefully the battery just needs it's contacts cleaned for your unit to work, but test the battery if you are sure that they are clean and seated properly to the contacts in the machine. If the battery appears to be failing, then contact www.irobot.com to cheack and see if they are still covered under your machine's warranty. Hope this helps! :)
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