How long to fully charge a FC40 battery?

[GeneralKitFisto]

I thought I had it charged last night, but didn't plug the balance thing into the charger.

I followed the instructions from DJI (Set the switch to 2A and plugged the balance cord into 3S), and it has been two hours. Still not even charging. There is a blinking red light instead of a steady one.

 

[GeneralKitFisto]

Update: I found a spare battery I had forgotten about. Plugged it into a different charger with same settings, and it is solid red.

 

[dtitus6297]

If the battery is severely discharged, it will sit there and blink until it gets within charging spec. It's fine, just takes a while. I lost my bird for an hour or so and when I found it the battery was down to 5 volts or so. The charger just blinked for like 2 or 3 hrs and then it finally started to charge and the battery is actually fine still suprisingly enough

 

[GeneralKitFisto]

I think I just got a bad battery. I had it plugged in all night, put it in my phantom, and it did the same thing. I put another battery in and it flew just fine