The 7 second timer is stop the battery from being strained btw.
Actually its just so they will last. The batteries inside a cig alike battery are so small that they can't handle a lot of amps or excess strain. It also helps against accidental overheating, like if for instance you had it in your pocket and the button was being pressed in. Instead of it firing until the carto was liquid and you recieved a burn, it'll safetly stop firing after 7 sec.
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