Hello everyone! I am brand new and happy to be here! I am having some problems with my Smok M80 plus (I know this is an outdated mod, but I really like it). After months of using this with no problems whatsoever, suddenly when I press the fire button, it doesn't fire and I get the message "High Input". I know the batteries on this aren't supposed to be replaceable, but was wondering if any of you have successfully replaced the batteries? I was unable to find any helpful information on how to replace the batteries on this mod.