Roomba 4210 replaced aps battery still does not work

click this link for help
http://uksupport.irobot.com/app/answers/detail/a_id/883/related/1/?cc=uk

Lift Roomba off the floor and place it in the center of the room and restart the clean cycle.

If Roomba did not resume cleaning, lift Roomba and turn it over.* Inspect the Side Wheels for dirt or obstructions.

Test the Side Wheels by pushing them in and out and making sure they rotate freely. Place Roomba in the center of the room and restart the clean cycle

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The power light changes color and on some models goes dim to indicate charge level. It will be ready to go when the light is at maximum illumination.

the charger is not charging its not putting any thing out into the batterys the charger clock is working but your not getting any charge from it

The charging circuit on the main board is fried. This is a common issue. You need some good electronic repair skills, and equipment, to replace the problem components

Are you using the home base or are you plugging the charger directly into the Roomba? If you are using the base, give plugging directly into the unit a try.

You might also try resetting the battery. With the battery out of the unit, press and hold the power button for 30 seconds or so. After this is done, plug the charger directly into the unit, and let it charge for 3 days (no kidding, 3 days). After that, if you still have issues, it might be time for a new battery, or time to send the little guy in for repair.

the battery on your roomba is dead, try charging it for 16 hours, after that if it still does not work. you need to replace the battery.

don't buy a new battery yet. you can reset the battery by charging for 16 hours, if this does not work, you need to take the battery out, push and hold the power button on your roomba for at least 15 seconds then reinstall the battery. plug in the charger directly to roomba not the docking station and charge until the battery light on the roomba is green. do not interrupt the battery charging cycle. after, leave the roomba charging for an additional 3 days or 72 hours. after, run roomba in max mode and run it till the battery is completely depleted. this will improve the battery overtime by charging again for 72 hours and depleting the battery. do this 3 or 4 times. and the battery should get better

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

It sounds like the battery is shot. These batteries only work for a couple of years and then they won't accept a charge any more. A common mistake people make is recharging them before they need it. This will make the battery "lazy"
Contact the manufacturer for more info.