No charge. Charger appears to be working and docking station also appears to be working. It is just dead.
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.
SOURCE: After being on the charger for days and the green
buy a new battery ,the old one isn't holding a charge
SOURCE: My Roomba Discovery doesn't appear to hold a charge
cor2an,
That sounds like a classic battery failure in the Roomba discovery series. There are sensors inside the battery pack that go bad too. Either way...it's not very practical to repair the battery....the best shot you have would be to order a replacement battery. You just pop the old one out and then put the new one in.
They are available from iRobot for $69 at this link: http://store.irobot.com/product/index.jsp?productId=2799714&cp=2804606.3358509&ab=CMS_AccSuper_Roomba400_102308&parentPage=family
There are sources of less expensive (about $35) Genuine iRobot quality batteries also. You could try www.RoboticVacParts.com at this link: http://cgi.ebay.com/OEM-iRobot-APS-battery-Roomba-400-4XXX-Discovery_W0QQitemZ270412120603QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ef5d1821b&_trksid=p4634.c0.m14.l1262&_trkparms=|301%3A1|293%3A1|294%3A30
SOURCE: 4210 and 4230 won't charge-new batteries.
I've been having the same problem myself. The charger is apparently built into the roomba main board. From what I've read there are two MOSFETs U2 & U4 that can go out and require replacement to fix the problem. More info here
http://www.robotreviews.com/chat/viewtopic.php?f=1&t=3909
SOURCE: iRobot 530 charges intermittently
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.)
SOURCE: My roomba mounts up to the charger the light
You have dead nimh (nickle metal hydride) batteries. You will need a replacement. You can test for this by removing the battery and holding the power button for 15 seconds. This will restart the charging cycle as if the battery were new.
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