Is it safe to store lithium batteries in the trunk during summer?

[JacksonLee]

Storing lithium batteries in the trunk during summer is not safe. Here are relevant details: Introduction to lithium batteries: Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive/negative electrode materials and non-aqueous electrolyte solutions. Due to the highly reactive chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become mainstream. Precautions for using lithium batteries: Do not place lithium batteries in any location exposed to direct sunlight. Keep lithium batteries away from heat sources. Before using lithium batteries, be sure to read the user manual and any warnings on the device. Do not spill water, saltwater, juice, or other liquids on lithium-ion batteries. Use battery chargers and AC adapters specifically designed for lithium batteries. Lithium batteries have designated positive and negative terminal orientations. Do not directly connect lithium batteries to a car's power socket or cigarette lighter socket without using a battery charger.

[GabriellaAnn]

I've been repairing cars for over a decade, and nothing scares me more in summer than seeing people store lithium batteries in their trunks. During the hottest days, trunk temperatures can reach 60-70°C. Regular lithium batteries have poor thermal stability and are prone to thermal runaway. Last year, I helped tow a spontaneously combusted vehicle caused by a power bank in the trunk. Metal-cased batteries fare slightly better, while polymer batteries are more likely to swell and leak. If you must store them, wrap them tightly with heat-resistant aluminum foil, keep them out of direct sunlight, and don't leave them for more than two hours. Especially with those off-brand power banks - their electrolytes decompose faster under high temperatures, and they might start smoking or catch fire without warning.

[OKaylee]

As a new energy vehicle owner, I've specifically studied lithium battery characteristics. Lithium batteries generally shouldn't operate above 45°C, and the trunk environment during summer exposure is too harsh. High temperatures accelerate chemical decomposition reactions, which may lead to separator damage and short circuits. I've measured my car's trunk temperature - it can reach 68°C at noon. I recommend storing batteries in shaded areas or using insulated bags, preferably with a thermometer for constant monitoring. I remember once leaving my drone battery in the car during camping - when I took it out, it was scalding hot and swollen. Now I never take such risks.

[DiEmery]

As someone who frequently drives long distances, I've learned a lesson: storing lithium batteries in the trunk during summer is like playing with fire. When thermal management fails, internal pressure in the battery can spike, potentially causing an explosion. Regular power banks might be salvageable, but high-capacity car emergency power supplies are far more dangerous. I once saw a car smoking at a service area—overheated trunk batteries were the culprit. Lately, I've switched to storing them in the front passenger storage compartment where the AC can at least reach them. If you must keep them in the trunk, travel during cooler evenings and remember to open windows for ventilation when parked.