VaporMon86

I'm new vaping and recently purchased another setup with an ego twist battery and kanger mt3 BCC tank. I have the ego-c charger and when I plugged the twist up to it it started flashing green and red instead of staying red like the ego-c. The battery must of already been pre-charged as I am able to vape with it. Any help on why the LED on the charger blinks instead of staying red? Or is this normal and will it go solid green when it is fully charged?