I have 4 Mavic Air batteries, one has been down to 1 led for about a week. I just plugged it in
and it blinks 2 times per second on the LED closed to the power button. Its inside, at normal temp
does not feel warm. Battery was in my drone when it crashed last week, but did not try to charge it
drone has been fixed (DJI Refresh) and other batteries work fine in it. Any ideas?

Hi, thank you for bringing this query for us. I will highly recommend you to send this battery to us for further evaluation since this battery is together with the drone when it crashed. This battery might be damaged as well, for your own safety kindly contact our support team to start up a ticket to this battery. You may refer to the link below . Thank you for your kind and understanding. Cheers!

https://www.dji.com/support

Thank you, they helped me out.