Checking on MacBook Air 13 battery life

Hello,

I have a MacBook Air 13 early 2014,1 week ago I've got its keyboard replaced by a technician at my city, since then, I've noticed the battery life has dropped drastically (from regular 10~12h now I only got 30 minutes!) I'm worried my original battery was replaced for another one.

I would like to know if there's any way to know if the Macbook still has its original battery.

Thank you!