The video highlights the dangers of lithium-ion batteries, which power many everyday items like scooters and electric toothbrushes. These batteries can explode or catch fire, posing significant risks. The New York City Fire Department demonstrated how quickly these batteries can become dangerous, emphasizing the need for caution. The batteries can ignite due to overcharging, overheating, punctures, or manufacturing defects, leading to rapid and intense fires. Such incidents have resulted in 40 deaths between 2017 and 2023. The video stresses the importance of using certified chargers, not leaving batteries unattended, and charging larger items like bikes and scooters outside to mitigate risks.