Hello all, I have a two ego-t's that don't work; a 650 and a 1100 mah. The 650 has a dead battery and the 1100's had a short on board where the button is. Does anyone see any safety issues with taking the board off of the 650 and putting on 1100 battery? I think they are both 3.7v. I'm hoping the Vision Spinner (1300 mah) I just ordered will last a whole lot longer than these two did.