A Few Important Words on Lithium Batteries
Lithium Ion batteries power everything today from smartphones, laptops to electric vehicles and energy storage systems. Their long lifespan and fast charging capabilities make them ideal for modern technology. However these same advantages also introduce safety risks. Understanding Lithium Ion battery hazards is essential for reducing the risk of fires, explosions and possible equipment damage.
To mitigate these risks, using a fireproof bag for lithium batteries is highly recommended. This protective measure can help contain potential fires and explosions, providing an additional layer of safety.
The safety concern with Lithium batteries during recharging is referred to as thermal runaway.
This happens when a battery overheats and triggers a chain reaction that creates great temperature increases, possible up to 1,800 Degrees F. Overcharging, internal short circuits, physical damage or defective cells can initiate this reaction. Once thermal runaway starts, it can lead to venting of flammable gases, fire or even explosion. Because recharging created electrical and thermal, stress, this is the most critical phase for battery safety.
Manufacturers have been incorporating internal safety features such as management systems, limiters for electrical current, temperature sensors and vents for excessive pressure. These features are to limit the possibility of exceeding safety levels. However as all safety features, they help to greatly reduce, not eliminate potential catastrophic failure. This is where a protective shield can play an important role in mitigating damage should a failure occur.
Protective shields used during lithium battery recharging are designed to contain heat, flames and debris. Most if not all commercial aircraft carry these systems in case of an inflight lithium fire (not required by the FAA as of early 2026). This is the reason vape pens, laptops, cell phones, etc are not allowed in checked bags. Should a battery experience thermal runaway while in the cargo hold, there would be no way to contain the fire. Thus a major safety violation.
These bags are often made from fiberglass or silicone coated materials. Aircraft specified containment bags are of a higher commercial quality than the ones available to the general public. Regardless which one is used, these are of recommended use when charging lithium batteries.
In the case of EV’s (Electric Vehicles), the batteries are built into rigid battery enclosures. These are typically constructed from steel or aluminum and may include ceramic or composite thermal barriers especially since aluminum has a 1,200 degree melt point. Below what a thermal runaway battery may experience.
A once very popular Hover Board that caught Fire
In addition to physical shields as discussed, lithium battery safety during recharging depends on a combination of safety factors.
Always use the original, designed charger from the manufacturer
Keep the batteries and components dry and out of moisture
Charge on a hard, non flammable surface. Never bedding or couches
Do not leave devices unattended while charging
Unplug the device once the battery is fully charged
For extra safety, always charge portable lithium batteries in a quality protective containment device