there have been instances of lipo packs stored fully charged swelling and eventually combusting, there was a writeup on this in one of the model flight magazines as someone lost their house. normally unless mistreated lipo's are pretty safe really, always balance charge, and always check for bad cells, especially if the pack is new or hasnt been used for some time. i store my less trusted/ less used packs in ammo boxes, make sure you drill a small ventilation hole in them though, as you could get a nasty surprise when opening if there has been a problem and the gases havent been able to escape.
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