My Roomba 655 series stopped working.
Googled for solutions. Replaced with new battery as recommended.
All lights came on when I put it for charging. After a few hours, checked and found that the lights are off. Roomba still doesn’t work.
Now it makes a ticking sound when put on charge. Sound continues even after pulling out the dust bin and changing the charging plug to a different wall socket as recommended above.
All contacts are clean. Tried with the dust bin pulled up.
Also tried the hard reset by pressing the Spot, Clean and Dock buttons simultaneously.
The only thing I have not tried is buying an external charger to charge the new battery.