If you are not using lipos for a couple of weeks, they are best stored at about half charge, around 3.8-3.9v per cell. If they are left fully charged, I have read that temp variations could lead them to go slightly overcharged, which can damage them. I had a Thunderpower flight pack puff after 5-6 cycles, despite being balance charged every time and being stored half charged. It was replaced luckily, and the new one fine. Probably just an unlucky pack.
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