When roomba is docked, the red battery light flashes, and doesn't seem to want to charge and when you operate it, it starts and stops. Does the battery need replacing?
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If Roomba senses that its battery has been significantly discharged,
Roomba will enter a special 16-hour refresh charge cycle. When the
16-hour refresh charge is initiated, the CLEAN light will quickly pulse
red/amber. Do not interrupt the cycle once it has begun. The 16-hour
refresh charge cycle is initiated by the robot and cannot be started
manually.
For long-term storage, always remove the battery from Roomba and
store in a cool, dry place. Blue or black batteries should be stored
after Roomba has been used. Yellow batteries should be stored after
being fully charged.
Battery capacity reduces overtime and usually the battery will need to
be replaced each year.
There's a chance that the battery you bought is bad. There's a greater chance that the problem is with the charger. If you're using the dock to charge, try plugging the charger directly into the roomba just to rule that out. If that doesn't fix the problem, I would try borrowing or buying a new charger, and see if that works. If a new charger and new battery don't solve the problem, the problem must be with your roomba itself.
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.)
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
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
Same thing happened to me, I called the company, and they told me to remove the battery, press the on button for 5 seconds, which clears the system, replace the battery and do a long charge 12 hours. I'm in the process of doing that now.
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