<![CDATA[iFixit - Answers With Device "iRobot Roomba 4210"]]> https://www.ifixit.com/Answers/Device/iRobot_Roomba_4210?rss=yes en-US Mon, 06 Jul 2026 01:25:35 -0700 <![CDATA[iRobot Roomba 4210: Roomba - New battery still won’t charge but glows red]]> I have a roomba discovery 4210. And a broken Roomba 4000. My discovery works fine. But needed a new battery. I ordered one. The battery will not charge in the discovery. I can charge the battery in the broken roomba by home base or directly to the machine. Then transfer it to the discovery and it will vacuum for a couple hours. When it’s discharged, I put it back in the broken Roomba to charge again. BECAUSE When I try to charge the battery in the discovery on the home base, the power button flashes red that the connection is made and it’s charging, but I can sit there for days and not charge. And if I plug the charger directly into the machine, same thing. It will glow red like it’s charging but it never actually charges. How can I get my discovery to actually charge the battery so I don’t have to keep switching the battery from different machines?

⟐ Edited December 29, 2023 at 11:16 MST

]]> https://www.ifixit.com/Answers/View/521952/Roomba+-+New+battery+still+won%E2%80%99t+charge+but+glows+red https://www.ifixit.com/Answers/View/521952 Fri, 29 Dec 2023 11:16:10 -0700