How much data does Hearthstone Mobile App use?

I've just started to play Hearthstone and I'm going to play it on my mobile phone while traveling.

I wonder how much data does the mobile app use on average for an online game?

Solution 1:

According to DisguisedToast's testing a year ago, an average game of Hearthstone takes about 150kb of data.

Comment thread: https://www.reddit.com/r/hearthstone/comments/32pgus/hearthstone_on_phones_data_usage_battery_drain/?st=isnec4pg&sh=b7259aa6

Solution 2:

Data usage seems relatively low, but in my experience the battery drain become an issue very quickly. Would recommend an external battery or staying plugged in if possible.