Hi, Welcome to ECF. Heat (whether an internal battery charged via USB or a separate charging station) is not good. Warm is okay, hot isn't. Hot is one step closer to "explode.": I agree that your battery probably died off if it was sitting uncharged and unused.
As others have said, it's time for a new setup, but if this is a real quitting attempt, the good news is that e-cig technology has progressed rather rapidly. It's quite likely that you'd find something you enjoyed more, in any case.
Do you vape MTL (higher resistance, lower wattage, and less vapor but higher nicotine) or sub0hm, lower resistance and much more vapor production at higher wattages and with lower nicotine? That will help determine a starting point for your next setup. What nic level were you using, as well (I would probably replace your eliquids too). You can get lots of suggestions and help on a setup, but knowing what your goals are with vaping this time will probably help you get more focused suggestions..
Welcome to ECF, and I hope you stick around. Really, ECF was monumentally helpful during my quitting attempt, and I have been smoke free for some time now.
Welcome!
Anna