Perhaps you have heard the stories of hoverboards and the Samsung Note 7 spontaneously exploding or catching on fire. The reason for the malfunction in these two products is the same: they both use a lithium-ion battery. Unfortunately, the reason why the battery can explode is also the reason why it is such a good battery.

When a battery is charging, it transports electrons from the positive cathode to the negative anode. When the battery is used, the electrons flow back to the cathode, releasing energy and powering the device

The lithium-ion battery takes this process up a notch, with lithium ions as well as electrons flowing between the cathode and anode. The electrons travel by way of an external wire, while the lithium ions use an electrolyte to travel through a membrane separating the cathode and anode. This process itself is safe, unless of course the membrane is punctured and the battery short circuits. Then the highly-reactive ions heat up, which heats up the flammable electrolyte and can cause an explosion.

So why are electronics companies still using lithium-ion batteries in their products? One reason is that lithium-ion batteries can store up to six times the energy as a normal lead-acid battery can, and in a much smaller area, according to a recent Cosmos article written by Jake Port. Another reason is that the malfunction appears in less than 0.01 percent of all Galaxy Note 7s, as an unnamed Samsung official reported. A simple switch of batteries could solve the problem, allowing consumers to keep their phones. However, it is safest to return the hoverboard or phone to the company.

Hoverboards often contain cheaper lithium-ion batteries, which are more prone to malfunctions. This is exacerbated by frequent use and misuse, such as travelling at high speeds and running into things. Hoverboards can be returned to the manufacturer for a refund or for a replacement. The Galaxy Note 7 has been recalled, and Samsung is offering an exchange program for the defective phones.