PRODUCT ID: Turnigy-3S

I have the charger Turnigy-3S and I have a question regarding this. I am planning to connect this to a battery connect it to an adapter and charge the battery. And here comes my question if I afther the charging is finished disconnects the adapter but let the Turnigy-3s stay connected to the battery will it drain the battery in reverse or is it made in a way that the current only goes through it the right way?

Regards Eivind