I've personally seen a set of IB4200's blow before. The second cell to the end blew. Shot the 1 cell at a wall and the impact caused the cell to have a huge dent, the other 4 cells were shot clean across the pit space (about 50 feet). IT was a hell of an explosion. It was loud enough to silence the entire building and all the truck's paused for a minute on the track.
Overcharging "non-high quality" cells isnt reccomended. ;) Id reccomend either GP 3300's or GP 3700's or if you want IB cells than 3800's will suffice.
The problem with nitro's these days are that they arent brushless... LOL
Losi 8ight e
MMM / Neu 1512 2.5d/f
Thunderpower 5s 5000
sorry no pics of it he just told me about it over the phone. He said it was the second to last cell in the pack. I didnt figure I was overcharging the cells since im using the superbrain 989.