i had my smokeless Image automatic (no button) 900 mah battery on the charging cable. This battery is probably around 3 years old. I have a bunch of these because my favorite vape is an auto battery with an iclear 16. Yes, I have more up to date stuff. But this is my fav. Anyway, I have always assumed since these are self contained they are safe. I have left this type of battery on a charger cable for days and never had an issue. Thankfully, I have heeded the warnings and the charger is across the room from my bed because I also charge the batteries for my ProVari in the same area. I take those out of the charger when they are done. I was laying in bed and start hearing a hissing sound. I turned on the light and smoke is coming from the battery. I grabbed the whole cable with the battery attached and threw it in the fire pit. It burned a hole in my entertainment center and scared the crap out of me. I have a bunch of these in the vapocalypse stash and I am wondering if I should be storing them in something fireproof or was this because I left in on the charging cable. I know I will be putting all my chargers in a cooking dish now and I will never leave any type of battery charging on its own. I just wonder if the stored ones could spontaneously blow up like that?