I had that problem with both of my extra batteries the first time I used them. It never happened again, but you might want to fly the batteries to 30% in a safe environment first, see if anything abnormal occurs.
Cleaned the contacts, error hasn't come back however went out to fly and noticed the status lights flashing a long red every 10 secondes. Overall status is showinf as normal?
I had this too, right after a firmware update that included batteries. All of my batteries did the same, power down and up removed the message. Glitch from the update?
Is that what the status light means? Because yes I am travelling and I am about 1/2 mile away from a no fly zone. I actually had to drive away because my hotel is in the NFZ.
Batteries are charging again now, I'll be out in a few hours to test away from the NFZ.
Keep us posted on how it went. If you haven't done so already, I would recommend resetting to factory defaults in the Assistant 2 Software to see if that makes a difference. It will clear out any odd presets, but it won't reset the firmware.