I think any warning leaflets should be mainly regarding safe storage and carrying. Most accidents are caused by hard shorts rather than low builds and most hard shorts usually occur due to idiots carrying them loose in their pockets or continuing to use them when the wrap or insulator is damaged.
I think it's important to remind buyers that cells have different ratings for different uses AND a warning to never mix different cells.
Perhaps also a reminder to only use chargers that come well recommended on forums.