Roomba Discovery series was packed away for about 3 months and it would not charge on the dock or the direct plug-in when unpacked. I bought a new battery and it ran fine when I popped it in, but still would not charge. Now it is dead and non-responsive. Is this a case of 2 bad batteries? Or something else?

Vacuums - iRobot - Roomba Discovery SE Bagless Robotic Vacuum