You guys are right, they are stuffin' all they can get in the sub-c's and I've seen way more of them pop than I have lipo. My buddy chris threw away a box of junk and had a couple of old packs in box on his carport and they got against something else and caught the box on fire. I had a IB 4200 vent and start smokin 20 min after it was charged, just sittin there in the car! Jimmy had a ep pack pop while charging and put dents in his discharger. It sounded like a m80 went off.