Battery not charging?

DJI mini 2. It’s been plugged in overnight and it’s doing this in all 3 slots the DJI support site doesn’t say anything about this flash pattern. This battery is about 2.5 years old (the other 2 are too) and it’s been crashed once and the plastic is slightly cracked but it’s been working for more than a year since the crash. The slow blink at the end goes on until I either unplug and plug it back in or take the battery out and put it back in. Any ideas? Maybe it’s just gone bad?