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Originally Posted by Hog
My apologies to the moderators if I'm not allowed to post a link to another forum, but in this instance and considering the safety aspect I should hope you will allow it to stand as it concerns us all. 
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The only reading I found ws that it wad the operators fault
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reason for any NiMH cell doing this is that the vent has been blocked when the cells were soldered. It doesn't have to be the visible hole o
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AS for why the cells went bang, I would say they were probably overcharged. - reasons for this could be as follows:
1) faulty charger
2) wrong charger settings. (e.g peak lockout time set too high / wrong delta peak,)
3) pack charged to start with / equalizer didn't work / wrong pack put on charger - if a pack is part charged to start with, the peak lockout designed to stop the pack from false peaking at the start of the charge will cause the battery to overcharge.
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So, in summary, the instructions the manufacturer gives were ignored in two key areas (soldering and supervision) and this happened. And, because the materials in the cells are basically inert, there were no subsequent fires, etc
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No faluty packs, just bad operators.