My buddy just blew up his WC 4200 battery a few minutes ago. All six cells came apart. They said one cell hit the ceiling, the rest were all over the floor. One of our buddies charged the battery with his ICE. The charger cut off at the temperature of 116. He unhooked the battery and set it on a piece of foam with cutouts and a fan under it for cooling. 15 minutes later the battery EXPLODED. lol. They don't know what caused it to blow, but he is short one battery now. HeHe