There are some risks and concerns with the li-ion batteries that everyone should be aware of;
There is a slight possibility that if it falls onto a solid surface with immense speed, it is likely to catch fire.
Discharging the li-ion battery completely could get it ruined.
High temperature is detrimental to its lifespan. Storing these batteries in hot temperatures would cause them to degrade at a quicker rate.
Their degradation starts immediately after they are shipped out of the factory. So, most lithium batteries are expected to last only two to three years from their date of manufacture.
There is a flammable electrolyte in these batteries capable of causing battery fires to occur on a small scale. This was seen in the Samsung Note 7, and it caused the manufacturers to stop further manufacturing and production.
Lithium batteries are not allowed on planes because there's the possibility that they might produce bizarre heat levels and could lead to an inextinguishable fire. That's the reason for the ban on li-ion batteries by aviation authorities.