I thought the battery must be bad because of sitting months or a year not charging, and also sometimes left on the charger for weeks, it finally would not turn on at all, and not charge.
I had tried unplugging and plugging back in a few times and pushing harder with a screwdriver… nothing.
Finally I got a new battery last week from Marketplace, it worked, then I plugged the old back in and it also worked…
Days later, nothing again. Today I tried both batteries in there and realized maybe one pin (furthest to the right) may be bent and not going into the plastic connector (hard to see). I think I got it bent back to go into the connector, but still nothing. The old connector looks like plastic blocking that pin, not sure what’s going on but could it damage something else not having the pin inserted?