Roomba 655 charging/not working problem

I haven't use my Roomba over a year. I charged it overnight. During charge, the clean green button and battery red light blinks at a 3-4 seconds frequency along with a electric clicking sound. It won't turn on after charging. No light, no sound, nothing... I tried to reposition the battery last night, I tried to clean the charging contacts; I bend the contact of the battery up; pretty much tried everything it may cause the problem. I called the tech support, the guy told me to purchase new home base and battery.......which cost over $100~ can anyone help on this please?