iRobot Lithium-ion Battery 4844236 - Model Number: 4844236 - Brand: iRobot - Battery Type: Lithium-ion - Accessories: With box Thank you for viewing. I ordered a battery, but the wrong one was sent to me. I was told that I couldn't return it after opening the package, so I would appreciate it if someone would buy it. The box has been opened, but the battery is new.