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 ... |