2012 Terrain USB Port Output

I quit smoking 6 weeks ago and now use a e-cigerette and I can get batteries hooked up to a USB port. I googled what I though it could be but came I up empty handed.
I was wondering if someone in here knows the maH/ hour,watt output or whatever output of the USB port in the consoles cubby between the front seats. I require a certain amount of power to charge the batteries of my e-cig, other than that it will kill the batteries before their time.