hmmm that doesn't sound right. I think the P1308 you refer to is a Kanger Evod battery (1308 is Kanger's model number).
The Evod battery has short circuit protection built in and the LED will flash if detected. If you connect something else with a stock coil to it does it seem to work ok? If it does it sounds like your coil is shorting and needs to be redone.
Hope this helps