If the connection points are clean and connected properly, but your battery still flashes, you can try your battery with other coils to see if other coils work. If other coils work, then it’s a defect coil you’re dealing with. If none of the coils work, it’s a problem with the battery. It’s more likely though, that it’s a coil problem and not a battery problem.
When there’s a short circuit problem with coils, it’s either a problem with the electronic pole in the atomizer or the 2 coil wires inside that connects to the pin. If the coil wires happen to touch each other at all, the coil won't work at all.
Short circuit issues are something that rarely happens, but in the event that it does, please take a video and send this to our support team so we can further identify the problem. After we review the video, our support team will provide you with a solution to the problem.