One of the guys that I race with (AND never beat!) had a SMC C-Max 5200 swell, one side opened on the hard case, he was going to toss it so I asked for it.
Two things I found,
1. the cells are glued and taped into the hard case, the glue released on one side, a cell didn't swell. It doesn't have a hard case now!
2. listed as a two cell, BUT its a four cells wired as a two cells.
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segmentfault
I have a Core-RC 3250 lipo that lost its balancing at the balance plug, carefully opened the end of the hard case and the red wire was loose, solder it back on everything is OK now, other than I have a hole in the end of the hard case.