If I restore my iPhone will it turn back on?

I got my phone wet one time and it wouldn't turn on and a computer guy plugged it into his computer and it was in recovery mode and he wiped off sensors or something and it worked? Well my phone randomly shut off again and I have it plugged in and its downloading an update and then it's gonna restore my iPhone but I'm scared that after I restore it that it still won't come on. I called the store and they said I might need a new battery but I don't have any money really so what should I do? Wait and see if it comes on?

Wait and see if it comes on. If not, you probably need a new battery!

Yes it will, i've done it several times with both my iphone and my ipod.