| Old cells, damage cell in a pack, too large the charging current, over-charge ... 
 I have a few packs of 6cells IB4200WC which I used for about 10 months. I use 6A for charging all the time and lately, some of the cells turn bad and start to "bomb" (minor) ...
 
 I used lower Amp to charge (eg, 5A) and the rest of the cells are still ok.
 
 But I know, it is about time to change all these old IB4200WC cells ...
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