Is BW on HANA free on AWS

I just registered for a new AWS account and i was eligible for free tier. I activated the BW on HANA free trial service launched recently.

I could used the BW on HANA server , but when i check my AWS usage report , it shows me charges of more than 280 US $ , It shows some 49 hours usage. I am not sure why is AWS (Amazon) charging when this is a free trial.

Has anybody faced similar situation ?