Okay so I'm getting a vamo v5 from fasttech, I'm trying to find the biggest mah 18650 battery I can, I've found some on ebay but not sure if I should use them. Will these be okay?? (won't let me post a link on my phone) Ultra Fire TR 18650 4500mAh 3.7V Rechargeble Battery CR it's on ebay foe like 2 bucks