My roomba discovery suddenly started having this problem - when docked or plugged in to charge, it seems to take forever to charge.. at first it did get to the green light, then when told to start it immediately signalled that the battery was dead; now it won't get to green light status after overnight or more of charging. I do not think this is a battery problem, I just replaced the battery pack and it was doing fine for a few weeks, then this happened. I think it is probably a problem in the charging circuit or something. My question is, is there anything I can do with it besides throwing it out?
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