Depends on how much you used it over those two years.
If you have a Mac, you can download Coconut Battery and run it. Connect the phone to the Mac and in Coconut battery, click on the iOS tab and you can see the capacity left and the amount of battery cycles you have left.
I have a two year old 5S that has 267 cycles with 86% capacity. It still lasts over a day if I put a sim in it and use it for a few days. On standby, it can 3-4 days with light use.