I have iRobot Roomba 4210 and I have a problem with charge battery. The battery is new. When I charging a battery in other iRobot Roomba the battery was full charged. When I charging in my iRobot Roomba the battery was empty. My fast charger is OK
Vacuums - iRobot - Roomba 4210 Bagless Robotic Vacuum
Answers & Comments
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